EN： The past perfect tense ('had' + past participle) is used to show that an action was completed before another action in the past. In this sentence, 'had gone' happened before 'reached'.
中文： 过去完成时（had + 过去分词）用于表示在过去某个时间点或动作之前，就已经完成的动作。在此句子中，「火车开走 (had gone)」发生在「我们到达 (reached)」之前。
By the time the police arrived, the thief had escaped.
当警察到达时，小偷已经逃跑了。
EN： 'By the time' is a subordinating conjunction used to introduce a time clause, meaning 'no later than the moment that'. It is commonly paired with the past perfect in the main clause.
中文： 「By the time」是从属连词，用来引导时间状语从句，意思是「最迟在...之时」或「当...的时候」。主句通常会搭配过去完成时使用。
By the time I finished my homework, everyone had gone to sleep.
当我写完作业时，大家都已经去睡觉了。
EN： The Past Perfect Tense ('had' + past participle) is used to describe an action that was completed before another action or a specific point in the past. In this sentence, 'had planned' happened before 'that' (the past reference point).
中文： 过去完成时（had + 过去分词）用于描述在过去某个动作或特定时间点之前就已经完成的动作。在本句中，「had planned」（已经规划）发生在「that」（那时，即过去的某个时间点）之前。
She had finished her homework before her mother came home.
在她妈妈回到家之前，她已经写完作业了。
EN： The prepositional phrase 'for weeks' is used to express duration, indicating how long an action lasted. When paired with the Past Perfect, it shows that the ongoing action had accumulated to that duration prior to the past reference point.
中文： 介词短语「for weeks」（好几周）用于表示持续时间，指出某个动作持续了多久。与过去完成时连用时，它表示在过去某个时间点之前，该持续进行的动作已经累积了那样的长度。
They had lived in London for years before they moved to Paris.
在搬到巴黎之前，他们已经在伦敦住了好几年。
EN： The Past Continuous tense ('were waiting') is used to describe an action that was in progress in the past, often interrupted by a shorter action in the Simple Past tense ('offered').
中文： 过去进行时（were waiting）用于描述过去正在进行的动作，通常会被另一个使用一般过去时（offered）的短暂动作所中断。
While I was studying, the phone rang.
当我正在读书时，电话响了。
EN： The conjunction 'while' is used to introduce a longer background action in the past continuous, setting the scene for another event.
中文： 连词「while」（当……时）用来引导一个较长的过去进行时背景动作，为另一个事件设定场景。
While they were cooking dinner, the power went out.
当他们正在做晚饭时，停电了。
EN： In English-speaking cultures, offering help to strangers who look lost or in distress is a common social norm, often referred to as 'random acts of kindness'. It reflects a community-minded spirit.
中文： 在英語系國家中，主動向看起來迷路或困惑的陌生人提供幫助是一種常見的社會規範，通常被稱為「隨機的善行」（random acts of kindness），這反映了互助的社區精神。
EN： The past perfect tense ('had' + past participle) is used to describe an action that was completed before another action or point in the past. In this sentence, 'had noticed' happened before the past state of 'looked completely lost'.
中文： 过去完成时（had + 过去分词）用于描述在过去某个动作或时间点之前就已经完成的动作。在本句中，「had noticed」（已经注意到）发生在过去的状态「looked completely lost」（看起来完全迷路）之前。
She had already left when I arrived at the office.
当我到达办公室时，她已经离开了。
EN： The verb 'look' is a linking verb (copular verb) here, meaning 'to appear'. It is followed directly by an adjective phrase ('completely lost') to describe the subject 'we', rather than an adverb.
中文： 动词「look」在此处作系动词（linking verb），意思是「看起来、显得」。其后直接接形容词短语（completely lost）来修饰主语「we」，而非接副词。
The children looked very excited about the trip.
孩子们看起来对这次旅行感到非常兴奋。
EN： The Past Perfect tense ('had' + past participle) is used to describe an action that was completed before another action in the past. In this sentence, 'had given up' happened before the past action 'spoke'.
中文： 过去完成时（had + 过去分词）用于描述在过去某个动作或时间点之前就已经完成的动作。在本句中，「已经放弃（had given up）」发生在过去的另一个动作「开口说话（spoke）」之前。
By the time the police arrived, the thief had already escaped.
在警方抵达之前，小偷就已经逃跑了。
EN： The phrasal verb 'give up' means to stop making an effort or to resign oneself to failure. When used with a noun like 'hope', it means to lose all expectation of a positive outcome.
中文： 短语动词「give up」意为停止努力或放弃。当与名词「hope（希望）」连用时，表示失去对美好结果的所有期盼，即「放弃希望」。
We should never give up our dreams.
我们永远不应该放弃我们的梦想。
EN： Indirect Speech (Reported Speech): When reporting what someone said in the past, the tenses in the reported clause usually shift backward (backshift). Here, the reporting verb 'told' is in the past tense, so the original spoken statement 'Another train has not left yet' (present perfect) shifts to 'another train had not left yet' (past perfect).
中文： 间接引语（转述语气）：当转述过去某人所说的话时，被转述从句中的时态通常需要向过去推移（时态回推）。在此句中，主要动词「told」（告诉）是过去时，因此原本说话时的「Another train has not left yet」（现在完成时）在转述时转变为「another train had not left yet」（过去完成时）。
She told me that she had already finished her homework.
她告诉我她已经写完作业了。
EN： Past Perfect Tense with 'yet': The past perfect tense (had + past participle) is used to describe an action that was completed (or not completed, in the negative) before a specific point in the past. The adverb 'yet' is used in negative sentences to show that something had not happened up to that past moment.
中文： 过去完成时与「yet」的搭配：过去完成时（had + 过去分词）用于描述在过去某个特定时间点之前已经完成（或在否定句中尚未完成）的动作。副词「yet」用于否定句中，表示直到过去那个时刻为止，某事尚未发生。
When I arrived, the meeting had not started yet.
当我到达时，会议还没有开始。
EN： The Past Perfect tense ('had' + past participle) is used to describe an action that was completed before another point or action in the past. Here, 'had never met' emphasizes that up to that specific moment in the past, the experience had not occurred.
中文： 过去完成时（had + 过去分词）用于描述在过去某个时间点或动作之前已经完成的动作。在这里，「had never met」强调直到过去那个特定时刻为止，该经验从未发生过。
She had never seen a glacier before she visited Alaska.
在她造访阿拉斯加之前，她从未见过冰川。
EN： The structure 'such a/an + adjective + singular countable noun' is used to emphasize the degree of a particular quality.
中文： 「such a/an + 形容词 + 单数可数名词」的结构用于强调某种特质的程度（如此……的人/物）。
He is such a talented musician.
他是个如此有才华的音乐家。
EN： The conjunction 'as' is used to describe two actions happening at the same time, often emphasizing that one action is occurring during the course of another.
中文： 连词「as」用于描述同时发生的两个动作，通常强调一个动作是在另一个动作的进行过程中发生的（意为「当……之时」）。
As we walked through the park, it started to rain.
当我们散步穿过公园时，天开始下雨了。
EN： The past continuous tense ('were pounding') is used to describe an ongoing action in the past, showing that the action was in progress at a specific moment.
中文： 过去进行时（「were pounding」）用于描述过去某个特定时间点正在进行的动作，强调该动作的持续状态。
They were laughing when I entered the room.
当我进入房间时，他们正在大笑。
EN： The phrase 'hearts pounding' is a common physiological description used in English literature and daily speech to vividly convey excitement, fear, or physical exertion.
中文： 「hearts pounding」（心臟劇烈跳動）是英文文學和日常口語中非常常見的生理描寫，用來生動地傳達興奮、恐懼或劇烈身體運動時的緊張感。
EN： The Past Perfect tense ('had' + past participle) is used to show that an action was completed before another action in the past. In this sentence, the doors opened ('had opened') before we caught the train ('caught').
中文： 过去完成时（had + 过去分词）用于表示在过去某个动作或时间点之前已经完成的动作。在本句中，车门开启（had opened）发生在我们赶上火车（caught）之前。
She had already finished her homework when her friends arrived.
当她的朋友到达时，她已经完成了作业。
EN： The conjunction 'just after' is used to emphasize that one event happened immediately following another event.
中文： 连词「just after」用于强调某个事件是在另一个事件之后「随即」或「刚好紧接着」发生。
The rain started just after we stepped inside the house.
我们刚踏进屋子，雨就开始下了。
EN： The past perfect tense ('had' + past participle) is used to describe an action that was completed before a specific point in time or another action in the past. In this context, it emphasizes that the learning of the lesson was completed on that specific past day.
中文： 过去完成时（had + 过去分词）用于描述在过去某个特定时间点或另一个过去动作之前就已经完成的动作。在此语境中，它强调「学到教训」这一动作在过去的那一天已经完成。
By the time the meeting started, we had already made our decision.
在会议开始之前，我们就已经做出了决定。
EN： The noun 'lesson' can mean a unit of instruction, but in this context, it refers to an experience or occurrence from which something can be learned (a moral or practical wisdom). It is often paired with the verb 'learn'.
中文： 名词「lesson」可以指课堂上的「一课」，但在这里是指从经验或事件中吸取的「教训」或「启示」。它经常与动词「learn」（学习/吸取）搭配使用。
Losing the game taught them a valuable lesson about teamwork.
输掉比赛给他们上了关于团队合作的宝贵一课。
EN： The Past Perfect Tense (had + past participle) is used to describe an action that was completed before another action or a specific time in the past. In this context, it emphasizes that the act of turning the day around occurred prior to the narrator's current perspective of looking back at the events.
中文： 过去完成时（had + 过去分词）用于描述在过去某个动作或特定时间点之前就已经完成的动作。在此语境中，它强调「扭转局面」这一动作发生在叙述者现在回首过去事件之前。
By the time the rain started, we had already set up the tent.
下雨之前，我们就已经搭好了帐篷。
EN： The phrasal verb 'turn something around' means to cause a situation, game, or relationship to change from bad to good, or to become successful.
中文： 短语动词「turn something around」意思是使局面、比赛或关系扭转乾坤，由坏变好或走向成功。
The new manager managed to turn the failing company around in just six months.
新经理成功在短短六个月内扭转了这家濒临倒闭的公司。
EN： The concept of 'paying it forward' or the transformative power of a stranger's kindness is a deeply valued theme in English-speaking cultures. Small acts of kindness are often celebrated as having the power to completely change someone's outlook or experience during a difficult day.
中文： 「把愛傳出去」或陌生人善意的轉化力量，是英語系國家文化中非常受重視的主題。微小的善行經常被歌頌為具有徹底改變他人糟糕一天的心境或經歷的力量。
EN： The past perfect tense ('had felt') is used here to describe a state or feeling that existed in the past, prior to another past moment (the moment of remembering, or the conclusion of the event). It emphasizes the depth of the feeling at that specific past time.
中文： 过去完成时（had felt）在此处用于描述在过去某个特定时刻之前就已存在并持续的状态或感受。它强调在过去那个特定时间点上，我们心中所感受到的感激程度。
She still remembered how excited they had been before the concert started.
她仍然记得在音乐会开始前，他们是多么地兴奋。
EN： The noun clause introduced by 'how' ('how grateful we had felt') acts as the direct object of the transitive verb 'remember'. It follows the declarative word order (subject + verb) rather than the question word order.
中文： 由「how」引导的名词性从句（how grateful we had felt）作为及物动词「remember」的直接宾语。此从句需使用陈述句语序（主语 + 动词），而非疑问句语序。
I don't know how busy he had been.
我不知道他之前有多忙。
EN： The Past Perfect Tense ('had' + past participle) is used to describe an action that was completed before another action or a specific time in the past. In this sentence, 'had looked forward to' happened before the past state of 'It was a trip'.
中文： 过去完成时（had + 过去分词）用于描述在过去某个动作或特定时间点之前就已经完成的动作。在本句中，「had looked forward to（期盼）」发生在过去状态「It was a trip（那是一趟旅行）」之前。
She had already finished her homework when her friends arrived.
当她的朋友到达时，她已经做完作业了。
EN： A relative clause starting with 'that' is used to modify a noun (the antecedent). Here, 'that I had looked forward to for months' is a defining relative clause modifying the noun 'trip'. 'That' acts as the object of the preposition 'to'.
中文： 以「that」引导的定语从句用于修饰名词（先行词）。在这里，「that I had looked forward to for months」是一个限定性定语从句，修饰名词「trip」。「that」在定语从句中担任介词「to」的宾语。
This is the book that I was talking about yesterday.
这就是我昨天提到的那本书。
EN： The Past Perfect tense ('had' + past participle) is used to describe an action that was completed before another action or a specific time in the past. In this sentence, 'had saved' and 'had planned' (with 'had' shared) happened before the trip actually took place.
中文： 过去完成时（had + 过去分词）用于描述在过去某个动作或特定时间点之前就已经完成的动作。在本句中，「had saved（存了钱）」和「[had] planned（规划了）」发生在旅行实际开始之前。
By the time the taxi arrived, we had already packed our bags.
在出租车到达之前，我们就已经打包好行李了。
EN： When joining two past perfect verbs with 'and', the auxiliary verb 'had' does not need to be repeated for the second verb if the subject remains the same. Here, 'had' applies to both 'saved' and 'planned'.
中文： 当使用并列连词「and」连接两个过去完成时的动词时，如果主语相同，第二个动词前的助动词「had」可以省略。在此句中，「had」同时修饰「saved」与「planned」。
She had washed the dishes and dried them before leaving.
她在离开前洗好了碗并把它们擦干了。
EN： The relative clause 'we left' modifies the noun phrase 'the morning'. In English, the relative pronoun 'when' or 'that' can be omitted when it functions as an adverbial or object in the defining relative clause.
中文： 定语从句「we left」修饰名词短语「the morning」。在英文中，当关系代词或关系副词（如 when 或 that）在限定性定语从句中充当状语或宾语时，通常可以省略。
On the day we met, it was raining heavily.
在我们相遇的那天，雨下得很大。
EN： The phrase 'go wrong' is an idiomatic expression meaning to experience problems, fail, or deviate from a plan. 'Go' functions as a linking verb here, followed by the adjective 'wrong'.
中文： 短语「go wrong」是一个习惯用语，意思是「出错、出状况、变糟」。这里的「go」作为系动词（linking verb）使用，后面接形容词「wrong」作为表语。
If anything goes wrong, please call me immediately.
如果出现任何差错，请立刻打电话给我。
EN： The Past Perfect Tense ('had' + past participle) is used to show that an action was completed before another action in the past. In this sentence, 'had already departed' happened before the action of 'arrived'.
中文： 过去完成时（had + 过去分词）用于表示在过去某个动作或时间点之前就已经完成的动作。在本句中，「火车已经出发（had already departed）」发生在「我们到达（arrived）」这个过去动作之前。
By the time the movie started, we had already bought our popcorn.
在电影开始之前，我们就已经买好爆米花了。
EN： The phrase 'By the time' is a subordinating conjunction used to introduce a time clause, meaning 'no later than the moment when'. It is typically followed by a simple past verb when referring to past events, with the main clause using the past perfect.
中文： 「By the time」是一个从属连词，用来引导时间状语从句，意思是「最迟在...之时」或「到了...的时候」。当描述过去的事情时，该从句通常使用一般过去时，而主句则使用过去完成时。
By the time she arrived at the party, most guests had left.
在她抵达派对时，大多数的客人都已经离开了。
EN： In English-speaking countries, train schedules are generally expected to be precise. Missing a train due to arriving late is a common travel anxiety. The use of 'departed' is slightly more formal than 'left', often used in official announcements or travel contexts.
中文： 在英語系國家，火車時刻表通常被預期是非常準確的。因為遲到而錯過火車是旅行中常見的焦慮來源。字彙方面，使用「departed」比「left」稍微正式一些，常見於官方廣播或旅行情境中。
EN： The Past Perfect Tense ('had' + past participle) is used to describe an action or state that occurred before a specific point in the past. In this sentence, 'had never felt' emphasizes that up until that moment in the past, they had never experienced such a deep level of disappointment.
中文： 过去完成时（had + 过去分词）用于描述在过去某个特定时间点之前已经发生或完成的动作或状态。在本句中，「had never felt」强调在过去的那一刻之前，他们从未体验过如此深切的失望感。
By the time she arrived, we had already finished the meeting.
在她到达之前，我们已经结束了会议。
EN： The adverb 'never' is placed between the auxiliary verb 'had' and the main verb (past participle) 'felt' to express absolute negation up to that past point.
中文： 否定副词「never」（从未）置于助动词「had」与主要动词（过去分词）「felt」之间，用以表达在过去该时间点之前，某事完全没有发生过。
He had never seen such a beautiful sunset before that trip.
在那次旅行之前，他从未见过如此美丽的日落。
EN： The phrase 'in my/our lives' is a common English idiom used to add extreme emphasis to a superlative or a strong feeling, equivalent to saying 'ever' or 'in all of my experience'.
中文： 片語「in my/our lives」（在我/我們一生中）是英文中常見的習慣用語，用來對最高級或強烈的情感進行極度的強調，相當於中文裡的「有生以來」或「這輩子最...」。
EN： The past continuous tense ('were standing') is used to describe an action that was in progress in the past, often interrupted by another shorter action in the simple past ('approached').
中文： 过去进行时（were standing）用于描述过去某个时间点正在进行的动作，通常会被另一个发生在过去的短暂动作（使用一般过去时 approached）所打断。
While we were watching TV, the phone rang.
当我们正在看电视时，电话响了。
EN： The adverb 'kindly' is used to modify the verb 'approached', describing the manner in which the action was performed.
中文： 副词「kindly」（亲切地）用来修饰动词「approached」（走向/靠近），描述该动作进行的方式。
She smiled kindly at the children.
她对孩子们亲切地微笑。
EN： The Past Perfect tense ('had' + past participle) is used to describe an action that was completed before another action or a specific time in the past. In this sentence, 'had seen' indicates his experiences of seeing lost travelers occurred prior to the past timeframe being discussed in the story.
中文： 过去完成时（had + 过去分词）用于描述在过去某个动作或特定时间点之前就已经完成的动作。在本句中，「had seen」表示他看见迷路旅客的经历，发生在故事所讨论的过去时间点之前。
She had already finished her report before the meeting started.
在会议开始之前，她就已经完成了报告。
EN： The preposition 'during' is used to indicate that something happens within a particular period of time. It is followed by a noun phrase (e.g., 'his years of work').
中文： 介词「during」（在……期间）用于表示某事发生在特定的时间段内。其后接名词短语（例如「his years of work」）。
We stayed indoors during the heavy rain.
下大雨期间我们都待在室内。
EN： The past perfect passive voice ('had not yet been canceled') is used to describe an action that was completed (or in this case, not completed) before another action in the past. It is formed with 'had' + 'been' + past participle.
中文： 过去完成时的被动语态（had not yet been canceled）用于描述在过去某个动作或时间点之前，已经完成（或在此处指尚未完成）的动作。其结构为「had」+「been」+ 过去分词。
The decision had been made before the meeting started.
在会议开始之前，决定就已经做好了。
EN： Noun clauses introduced by 'that' function as the direct object of reporting verbs like 'explain', 'say', or 'think'. The word 'that' can often be omitted in informal speech, but is kept here for clarity.
中文： 由「that」引导的名词性从句，在句中作为「explain（解释）」、「say（说）」或「think（认为）」等述说动词的直接宾语。在口语中「that」常可省略，但在此处保留以使语义更清晰。
She explained that the office was closed for the holiday.
她解释说办公室因为放假而关闭了。
EN： The past perfect tense ('had lost') is used to describe an action that was completed before another action in the past ('were given').
中文： 过去完成时（had + 过去分词，如 'had lost'）用于描述在过去某个动作或时间点之前就已经完成的动作。在此句中，『失去座位』发生在『被给予新座位』之前。
By the time the train arrived, we had lost our tickets.
当火车到达时，我们已经弄丢了车票。
EN： The passive voice in the past simple tense ('were given') is used when the focus is on the receiver of the action rather than the doer.
中文： 一般过去时的被动语态（was/were + 过去分词，如 'were given'）用于强调动作的接受者（我们），而非动作的执行者（谁给了我们座位）。
They were given a warm welcome when they arrived.
他们抵达时受到了热烈的欢迎。
EN： The past perfect tense ('had been') is used to describe an action or state that occurred before another action in the past (in this case, before 'realized').
中文： 过去完成时（had + 过去分词）用于表示在过去某个时间点或动作（此处为「意识到 realized」）之前，就已经发生或持续存在的状态。
By the time the movie started, we had already bought our popcorn.
在电影开始之前，我们就已经买好爆米花了。
EN： The conjunction 'as' is used here to mean 'while' or 'at the same time that', indicating two actions happening simultaneously in the past.
中文： 连词「as」在此处表示「当……的时候」或「与此同时」，用来表示过去同时发生的两个动作。
As the sun set, the temperature dropped quickly.
当太阳下山时，气温迅速下降。
EN： The Past Perfect Tense ('had' + past participle) is used to describe an action that was completed before another action or a specific time in the past. In this sentence, 'had saved' and 'had nearly lost' both refer to events that occurred prior to the main narrative focus of the past trip.
中文： 过去完成时（had + 过去分词）用于描述在过去某个动作或特定时间点之前就已经完成的动作。在本句中，「had saved」（挽救了）与「had nearly lost」（差点错失）皆表示在过去该次旅行的叙事背景中，更早一步发生的动作或状态。
By the time we arrived, the train had already left.
在我们到达之前，火车就已经开走了。
EN： A relative clause (adjective clause) can modify a noun. In 'a trip [that/which] we had nearly lost', the relative pronoun 'that' or 'which' is acting as the object of the verb 'lost' and is omitted, which is common in informal and semi-formal English.
中文： 定语从句（形容词性从句）可用于修饰名词。在「a trip [we had nearly lost]」中，关系代词「that」或「which」在从句中担任动词「lost」的宾语，因此被省略了，这在非正式与半正式英语中非常常见。
The book we read yesterday was very interesting.
我们昨天读的那本书非常有趣。
EN： The verb 'teach' can take a double object (ditransitive structure) where 'me' is the indirect object and the 'that' clause ('that hope can appear...') acts as the direct object, functioning as a noun clause.
中文： 动词「teach」（教）可接双宾语（双宾动词结构），其中「me」是间接宾语，而由「that」引导的从句（that hope can appear...）则作为直接宾语，起名词性从句的作用。
She taught me that hard work always pays off.
她教会了我，努力终究会有回报。
EN： The adverb 'least' is used here to modify the verb 'expect' in a superlative sense, meaning 'at the minimum degree' or 'not at all expected'.
中文： 副词「least」在此处用于修饰动词「expect」，具最高级意义，表示「程度最低」或「最意想不到」。
It happened when I least expected it.
它在我最意想不到的时候发生了。
EN： This sentence expresses a common philosophical sentiment in English-speaking cultures: the idea of finding hope or light in dark times, often associated with resilience and optimism.
中文： 這句話表達了英語文化中常見的一種哲理：在黑暗或艱難的時刻尋找希望與光芒，這通常與韌性（resilience）和樂觀主義緊密相連。
EN： The past simple tense of the verb 'to be' (was/were) is used to ask about states or feelings in the past. In questions, the verb 'were' is placed before the subject 'you'.
中文： 过去一般时的 be 动词（was/were）用于询问过去的状态或感受。在疑问句中，动词「were」要置于主语「you」之前。
Why were you so late for the meeting yesterday?
你昨天开会为什么迟到那么久？
EN： The demonstrative adjective 'that' is used to refer to a specific time in the past (e.g., 'that morning'), distinguishing it from 'this morning' (which refers to today).
中文： 指示形容词「that」（那）用于指代过去某个特定的时间（例如「that morning」那一天早上），以区别于「this morning」（今天早上）。
I will never forget the storm that night.
我永远不会忘记那天晚上的暴风雨。
EN： In English-speaking cultures, asking 'Why were you so upset...?' is a common way to show empathy and open a supportive conversation when you notice a friend was distressed in the past. Adding the person's name at the end (e.g., ', Emma') softens the question and makes it feel more personal and caring.
中文： 在英語系國家中，詢問「Why were you so upset...?」（你那時為什麼那麼難過？）是表達同理心並開啟關懷對話的常見方式。在句尾加上對方的名字（例如「, Emma」）可以緩和語氣，使詢問顯得更具親切感與關懷。
EN： The Past Perfect Tense ('had' + past participle) is used to show that an action was completed before another action in the past. In this sentence, 'had left' happened before 'arrived'.
中文： 过去完成时（had + 过去分词）用于表示在过去某个动作或时间点之前就已经完成的动作。在本句中，「公交车开走 (had left)」发生在「我们抵达 (arrived)」之前。
The movie had already started when we arrived at the theater.
当我们到达电影院时，电影已经开始了。
EN： The subordinating conjunction 'before' is used to connect two events in the past, clarifying the chronological order. The event following 'before' is the later event, usually in the simple past tense.
中文： 从属连词「before（在……之前）」用于连接过去发生的两个事件，以厘清时间先后顺序。接在 before 后面的事件是较晚发生的，通常使用一般过去时。
She washed her hands before she ate dinner.
她在吃晚饭前洗了手。
EN： The Past Perfect tense ('had' + past participle) is used to show that an action happened before another action in the past. In this sentence, forgetting the ticket ('had forgotten') happened before realizing it ('realized').
中文： 过去完成时（had + 过去分词）用于表示某个动作在过去的另一个动作之前已经发生。在本句中，「忘记带车票」（had forgotten）发生在「意识到」（realized）之前。
She realized she had left her keys in the car.
她意识到她把钥匙留在车上了。
EN： The conjunction 'that' is often omitted in informal English when introducing a noun clause acting as the direct object of verbs like 'realize', 'think', or 'say'. Here, 'I realized [that] I had forgotten...'
中文： 在非正式英语中，当引导名词性从句作为「realize（意识到）」、「think（认为）」或「say（说）」等动词的直接宾语时，连词「that」经常会被省略。本句中为「I realized [that] I had forgotten...」。
I think we need to leave now.
我觉得我们现在该走了。
EN： The Past Perfect tense ('had' + past participle) is used to describe an action that was completed before another action in the past. Here, 'had waited' happened before the past action 'came'.
中文： 过去完成时（had + 过去分词）用于描述在过去某个动作或时间点之前就已经完成的动作。在本句中，「已经等待」（had waited）发生在另一个过去动作「到来」（came）之前。
They had already finished dinner before the guests arrived.
在客人到达之前，他们就已经吃完晚餐了。
EN： The conjunction 'before' is used to connect two clauses, indicating that the action in the main clause (Past Perfect) occurred prior to the action in the subordinate clause (Simple Past).
中文： 连词「before」（在……之前）用于连接两个从句，表示主句的动作（过去完成时）发生在从句的动作（一般过去时）之前。
She had left the office before it started to rain.
在开始下雨之前，她就已经离开办公室了。
EN： The phrase 'by the time' is a subordinating conjunction used to introduce a time clause. It means 'no later than the moment that' and is commonly used with the past perfect tense in the main clause to show that one action was already completed before another past action occurred.
中文： 「by the time」是一个从属连词，用来引导时间状语从句，意思是「到了…的时候」或「最迟在…之时」。它常用于主句为过去完成时的句子中，用以表示在过去的某个动作发生之前，另一个动作已经完成。
By the time the police arrived, the thief had escaped.
等警察到达时，小偷已经逃跑了。
EN： The past perfect tense ('had' + past participle) is used to describe an action that was completed before another action or a specific time in the past. In this sentence, 'had started' happened before 'sat down'.
中文： 过去完成时（had + 过去分词）用于描述在过去某个动作或特定时间点之前就已经完成的动作。在本句中，「表演开始」（had started）发生在「坐下」（sat down）之前。
She had already finished her homework when her mother came home.
当她妈妈回到家时，她已经写完作业了。
EN： The Past Perfect Tense (had + past participle) is used to describe an action that was completed before a specific point in the past. In this sentence, 'had never seen' indicates that the experience of seeing such heavy traffic had not occurred at any point prior to the past event being discussed.
中文： 过去完成时（had + 过去分词）用于描述在过去某个特定时间点之前已经完成的动作或经历。在此句子中，「had never seen」表示在所讨论的过去事件之前，从未有过看过如此严重堵车的经历。
She had never traveled abroad before that summer.
在那年夏天之前，她从未出国旅游过。
EN： The construction 'such + adjective + uncountable noun' is used to emphasize the degree or quality of something. Here, 'such heavy traffic' emphasizes the extreme density of the traffic.
中文： 「such + 形容词 + 不可数名词」的结构用于强调某事物的程度或特质。在这里，「such heavy traffic」强调了交通拥堵的极端严重程度。
I have never heard such beautiful music.
我从未听过如此美妙的音乐。
EN： In English-speaking countries, 'heavy traffic' is the standard collocation to describe congested roads or traffic jams. Using 'big traffic' or 'busy traffic' is grammatically unnatural. Additionally, discussing traffic delays is a very common, relatable icebreaker or excuse for being late in daily conversation.
中文： 在英語系國家中，「heavy traffic」是描述道路擁擠或塞車的標準搭配詞。使用「big traffic」或「busy traffic」在英文習慣上是不自然的。此外，在日常對話中，抱怨交通延誤是一個非常常見、容易引起共鳴的破冰話題，也是遲到時常用的合理解釋。
EN： The Past Perfect tense ('had' + past participle) is used to show that an action was completed before another action in the past. Here, 'had prepared' happened before 'stayed calm'.
中文： 过去完成时（had + 过去分词）用于表示在过去某个动作或时间点之前已经完成的动作。在此句中，「准备」（had prepared）发生在「保持冷静」（stayed calm）之前。
She had finished her homework before she went to bed.
她在上床睡觉前已经完成了作业。
EN： The coordinating conjunction 'so' is used to link two independent clauses, where the second clause is the result or consequence of the first.
中文： 并列连词「so」（所以）用于连接两个独立分句，其中第二个分句是第一个分句的结果或影响。
It was raining, so we decided to stay indoors.
下雨了，所以我们决定待在室内。
EN： The phrase 'stay calm' reflects a highly valued trait in many English-speaking cultures, often associated with the British concept of the 'stiff upper lip'—remaining resolute and unemotional in the face of adversity.
中文： 「stay calm」（保持冷靜）反映了許多英語系國家非常推崇的特質，這常與英國人所說的「stiff upper lip」（堅忍不拔）相呼應，意指在面對逆境時仍能保持堅毅與沉著，不感情用事。
EN： The Past Perfect tense ('had' + past participle) is used to show that an action was completed before another action in the past. In this sentence, 'had stopped' happened before 'continued'.
中文： 过去完成时（had + 过去分词）用于表示在过去某个动作或时间点之前就已经完成的动作。在本句中，「雨停（had stopped）」发生在「继续前进（continued）」之前。
After she had finished her homework, she went to bed.
在她写完作业之后，她就去睡觉了。
EN： The phrasal verb 'continue on' means to keep moving forward or to persist in an activity, often after a brief interruption.
中文： 短语动词「continue on」意为「继续前进」或「持续进行某活动」，通常用于短暂中断之后重新开始。
We rested for a while and then continued on our journey.
我们休息了一会儿，然后继续我们的旅程。
EN： The Past Perfect tense ('had' + past participle) is used to describe an action that was completed before another action or a specific time in the past.
中文： 过去完成时（had + 过去分词）用于描述在过去某个动作或特定时间点之前就已经完成的动作。
By the time the train arrived, we had already bought our tickets.
在火车到达之前，我们就已经买好票了。
EN： The nominalization pattern 'the + adjective' (e.g., 'the unexpected') is used to represent a class of things or people as a collective noun, meaning 'things that are unexpected'.
中文： 「the + 形容词」的限定结构（例如 'the unexpected'）可用作名词，代表某一类事物或群体，在此处意为「意料之外的事物」。
We must prepare for the worst.
我们必须为最坏的情况做好准备。
EN： The phrase 'expect the unexpected' is a common English idiom and proverb. It encourages people to remain flexible and mentally prepared for sudden changes or surprises in life, reflecting a pragmatic and resilient cultural mindset.
中文： 「expect the unexpected」（期待意料之外的事）是英語中非常常見的成語與諺語。它鼓勵人們在生活中保持彈性，隨時做好應對突發狀況或驚喜的心理準備，反映出西方文化中務實且具韌性的處事態度。
EN： The participle phrase 'Looking back' functions as an adverbial modifier, indicating the action of reflecting on the past. It is a shortened form of 'When we look back' or 'As I look back'.
中文： 分词短语「Looking back」（回首过去）用作状语，表示回顾过去的动作。它是「When we look back」或「As I look back」的简化形式。
Looking back, I realize how much I have grown.
回首过去，我意识到自己成长了多少。
EN： The past perfect tense ('had changed') is used to describe an action that was completed before a specific point in the past or before another past action.
中文： 过去完成时（「had changed」）用于描述在过去某个特定时间点之前，或在另一个过去动作之前已经完成的动作。
By the time the meeting started, the decision had changed.
在会议开始之前，决定就已经改变了。
EN： The phrase 'Looking back' is a very common transitional device in English storytelling. It signals a shift from chronological narration to reflective commentary, allowing the speaker to share a mature perspective on past events.
中文： 「Looking back」（回首過去）是英文敘事中非常常見的過渡表達。它標誌著從按時間順序敘述轉向反思性評論，讓說話者能夠分享對過去事件更成熟的看法與感悟。
重要单词附有 IPA 发音、定义、例句和互动式测验。
在本文中： 出发、启程、驶离
在本文中： 感到失望的
在本文中： 靠近、接近
在本文中： 取消的
在本文中： 感激的、感谢的
在本文中： （心脏）剧烈跳动
在本文中： 意料之外的事物
在本文中： 陌生人
片语包含类型标示、双语定义、用法说明和例句。
To cause a situation, game, or team to change from bad to good; to make something successful.
好转、扭转局面
To feel pleased and excited about something that is going to happen.
期待、盼望
To stop believing that something good will happen or that you will succeed.
放弃希望
To be prepared for any surprise or unusual event, even if it seems unlikely.
做好应对突发状况的准备、预料意料之外的事