EN： The present perfect tense (has/have + past participle) is used here with 'left' (though expressed as simple past 'left' in casual speech, it implies a present result). 'Left' is the past tense of 'leave', meaning to allow something to remain in a place.
中文： 動詞「leave」（留下/遺忘）的過去式為「left」。在這裡使用過去簡單式「left」來描述過去發生的動作（把包包留在這裡），而這個動作的結果（包包還在這裡）對現在造成了影響。
I left my keys on the kitchen table.
我把鑰匙留在廚房桌上了。
EN： The interrogative pronoun 'Whose' is used to ask about possession. In the question 'Whose can it be?', 'whose' acts as a possessive pronoun meaning 'whose bag', and 'can' is a modal verb used to express possibility or speculation.
中文： 疑問代名詞「Whose」（誰的）用來詢問物品的所有權。在「Whose can it be?」這個問句中，「whose」作為所有格代名詞，代表「誰的包包」，而助動詞「can」則用於表示對可能性的推測或懷疑。
Whose is this jacket?
這件夾克是誰的？
EN： The modal verb 'might' is used to express a weak possibility or uncertainty about a present or future situation. It suggests that something is possible, but not certain.
中文： 情態助動詞 'might' 用於表示對現在或未來情況的微弱可能性或不確定性。它暗示某事是有可能的，但並不確定。
It might rain later, so you should take an umbrella.
等一下可能會下雨，所以你應該帶把傘。
EN： The phrasal verb 'belong to' means to be the property of someone. It is a stative verb, meaning it is not typically used in the continuous (-ing) tenses.
中文： 片語動詞 'belong to' 意思是「屬於某人（的財產）」。它是一個狀態動詞，這意味著它通常不適用於進行式（-ing）。
This book belongs to Sarah.
這本書是莎拉的。
EN： The modal verb 'can't' (cannot) is used to express a strong negative deduction or certainty based on evidence. It means 'it is impossible that...'.
中文： 情態助動詞 'can't'（cannot）用於表示基於證據的強烈否定推論或確定性，意思是「不可能……」。
It can't be raining; the sky is completely clear.
不可能在下雨；天空完全是晴朗的。
EN： Possessive pronouns (such as 'mine', 'yours', 'his', 'hers', 'ours', 'theirs') are used to replace a possessive adjective and a noun to avoid repetition. Here, 'mine' replaces 'my bag'.
中文： 所有格代名詞（如 'mine'、'yours'、'his' 等）用來代替「所有格形容詞 + 名詞」以避免重複。在此句中，'mine' 代替了 'my bag'（我的包包）。
Your car is red, but mine is green.
你的車是紅色的，但我的（車）是綠色的。
EN： The modal verb 'must' is used here to express a strong logical deduction or certainty based on evidence. It translates to '一定' (must be) in this context.
中文： 情態助動詞「must」在此處用於表示基於證據的強烈邏輯推論或肯定。在這種語境下，它翻譯為「一定」。
She must be tired after working all day.
工作了一整天，她一定累了。
EN： The preposition 'with' is used to indicate the cause or reason for a state (in this case, being heavy). It means '因為...' or '伴隨著...'.
中文： 介係詞「with」在此處用於表示某種狀態（在此指「很重」）的原因或伴隨情況。意思是「因為……」或「裝著……」。
His hands were shaking with cold.
他的手因為冷而發抖。
EN： The modal verb 'could' is used here to express a weak or tentative possibility in the present. It suggests that something is possible, but the speaker is not entirely certain.
中文： 情態助動詞「could」在此處用於表示現在時間裡較為微弱或不確定的可能性。它表示某事是有可能的，但說話者並非百分之百確定。
The keys could be in your coat pocket.
鑰匙可能在你的外套口袋裡。
EN： The prepositional phrase 'in the library' acts as an adverbial of place, indicating the location of the subject. It consists of the preposition 'in' followed by the noun phrase 'the library'.
中文： 介係詞片語「in the library」作為地方副詞片語，用來指示主詞所在的地點。它由介係詞「in」和名詞片語「the library」組成。
The students are studying in the library.
學生們正在圖書館裡學習。
EN： The modal structure 'might have + past participle' is used to express a weak or uncertain possibility about a past event. It suggests that something possibly happened, but the speaker is not entirely sure.
中文： 助動詞結構「might have + 過去分詞（p.p.）」用於表示對過去事件的微弱或不確定推測。這意味著某事在過去有可能發生，但說話者並不完全確定。
He might have missed the bus this morning.
他今天早上可能錯過公車了。
EN： The preposition 'after' is used here as a preposition of time, meaning 'subsequent to' or 'later than' a specific event (in this case, 'class').
中文： 介係詞「after」在此處用作時間介係詞，意思是「在...之後」，表示在某個特定事件（在此處為「下課」）之後發生的時間點。
We went for a walk after dinner.
我們晚餐後去散步了。
EN： The modal verb 'can't' (cannot) is used to express a strong negative deduction or certainty. When we say 'it can't be...', we are 99% sure that something is impossible based on present evidence.
中文： 情態助動詞 'can't'（cannot）用於表示強烈的否定推論或確定性。當我們說 'it can't be...' 時，代表我們根據目前的證據，有極高的把握（約 99%）認為某事是不可能的。
It can't be raining; the sky is completely clear.
不可能在下雨；天空完全是晴朗的。
EN： The verb 'hear' is a verb of perception. It can be followed directly by an object ('something') and an adverbial of place ('inside') to describe what is being perceived and where.
中文： 動詞 'hear'（聽見）是一個感官動詞。後面可以直接接賓語（'something'，某物）和地方副詞（'inside'，在裡面），用來描述所感知到的事物及其位置。
I hear a strange noise outside.
我聽到外面有奇怪的聲音。
EN： The modal verb 'must' is used here to express a strong logical deduction or certainty based on evidence. It translates to 'must be' or 'definitely is' in this context.
中文： 情態助動詞「must」在此處用於表示基於證據的強烈邏輯推論或肯定（一定、必定）。
The lights are on, so they must be home.
燈亮著，所以他們一定在家。
EN： The present participle (verb-ing) 'rattling' acts as an object complement, describing the action or state of the noun 'water bottle' at the moment of perception.
中文： 現在分詞（動詞-ing）「rattling」在此作為受詞補語，用來描述名詞「water bottle」在被察覺時的動作或狀態（正在發出喀噠聲）。
I can hear the rain falling on the roof.
我能聽到雨水落在屋頂上的聲音。
EN： The modal verb 'may' is used to express possibility or uncertainty in the present or future. It suggests that something is possible but not certain (about a 50% chance). It is followed by the base form of the verb.
中文： 情態助動詞「may」用於表示現在或未來「可能性」或「不確定性」。它表示某事有可能發生但並不完全確定（大約有 50% 的機率）。其後必須接動詞原形。
It may rain later, so you should take an umbrella.
等一下可能會下雨，所以你應該帶把傘。
EN： The verb 'give' is a ditransitive verb, which means it can take two objects: an indirect object (usually a person, here 'us') and a direct object (usually a thing, here 'a clue'). The typical pattern is 'give + indirect object + direct object'.
中文： 動詞「give」（給）是雙賓語動詞（授與動詞），這意味著它可以接兩個受詞：間接受詞（通常是人，此處為「us」）和直接受詞（通常是物，此處為「a clue」）。常見句型為「give + 間接受詞 + 直接受詞」。
She gave me a beautiful book.
她給了我一本漂亮的書。
EN： The modal verb 'could' is used here to express a weak or tentative possibility in the present or future, meaning 'it is possible that'. It is less certain than 'may' or 'must'.
中文： 情態助動詞 'could' 在此處用於表示現在或未來較弱或不確定的可能性，意思是「有可能」。它的肯定程度低於 'may' 或 'must'。
It could rain later, so you should take an umbrella.
待會兒可能會下雨，所以你應該帶把傘。
EN： The phrasal verb 'belong to' means to be the property of someone. It is a non-progressive (stative) verb, meaning it is not typically used in the continuous (-ing) tenses.
中文： 片語動詞 'belong to' 意思是「屬於某人（的財產）」。它是一個靜態動詞，通常不用於進行式（-ing 形式）。
This bicycle belongs to my brother.
這輛腳踏車是我弟弟的。
EN： The modal verb 'must' combined with the continuous aspect 'be + -ing' (must be doing) is used to express a strong, logical deduction about an action that is likely happening right now. It indicates that the speaker is almost certain about the current activity based on evidence.
中文： 情態助動詞「must」結合進行式「be + -ing」（must be doing）用於對此時此刻正在發生的動作進行強烈的邏輯推測。這表示說話者根據現有的線索，對目前正在進行的活動感到幾乎可以確定。
She must be sleeping now because her room is completely dark.
她現在一定正在睡覺，因為她的房間完全是暗的。
EN： The phrasal verb 'look for' means to search for something or someone. When used with a pronoun object like 'it', the pronoun must be placed directly after the preposition 'for' (look for it).
中文： 片語動詞「look for」意思是尋找某物或某人。當與代名詞受格（如「it」）連用時，該代名詞必須直接放在介係詞「for」後面（寫成 look for it）。
I lost my keys and I am looking for them.
我弄丟了鑰匙，我正在尋找它們。
EN： The structure 'Let's + base verb' is used to make a suggestion or proposal that includes the speaker. It is a contraction of 'Let us'.
中文： 「Let's + 原形動詞」結構用於提出包含說話者在內的建議或提議。它是「Let us」的縮寫形式。
Let's start the meeting now.
我們現在開始開會吧。
EN： Tag questions with 'Let's' typically use 'shall we?' to politely ask for agreement or confirmation, making the suggestion sound softer and more cooperative.
中文： 以「Let's」開頭的祈使句，其附加問句通常使用「shall we?」，用於禮貌地尋求對方的同意或確認，使建議聽起來更溫和且具合作意圖。
Let's go for a walk, shall we?
我們去散個步，好嗎？
EN： In British and Commonwealth English, 'shall we?' is a very common and natural way to end a suggestion starting with 'Let's'. In American English, it is also widely used, though sometimes 'okay?' or 'should we?' might be heard in more casual contexts. Using 'shall we?' adds a touch of politeness and collaborative spirit.
中文： 在英式英語與大英國協國家中，以「shall we?」作為「Let's」開頭建議的結尾是非常普遍且自然的用法。在美式英語中也相當常見，儘管在更口語的非正式情境中，人們有時會用「okay?」或「should we?」。使用「shall we?」能增添一種禮貌與共同參與的溫和語氣。
EN： The Simple Past Tense is used to describe actions that were completed at a specific time in the past. In this sentence, 'found' is the irregular past tense form of the verb 'find'.
中文： 簡單過去式（Simple Past Tense）用於描述在過去特定時間已經完成的動作。在本句中，「found」是動詞「find」的不規則過去式變化。
Yesterday I found a lost wallet on the street.
昨天我在街上發現了一個遺失的皮夾。
EN： Time expressions like 'this morning' can function as adverbial modifiers. They are often placed at the very beginning or the very end of a sentence to establish the timeframe of the event.
中文： 像「this morning」（今天早上）這樣的時間副詞片語，常用於修飾整個句子。它們通常放在句首或句尾，用來建立事件發生的時間背景。
This morning she drank a cup of black coffee.
今天早上她喝了一杯黑咖啡。
EN： The coordinating conjunction 'so' is used to connect two independent clauses, showing a cause-and-effect relationship where the second clause is the result of the first.
中文： 對等連接詞「so」（所以）用於連接兩個獨立子句，表示因果關係，第二個子句為第一個子句所產生的結果。
It was raining, so we stayed indoors.
下雨了，所以我們待在室內。
EN： An indirect question is used inside another sentence (here, as the object of 'wondered'). Unlike direct questions, indirect questions use statement word order (subject + verb) instead of question word order.
中文： 間接問句用於另一個句子中（在此作為動詞「wondered」的賓語/受詞）。與直接問句不同，間接問句使用陳述句語序（主詞 + 動詞），而非疑問句語序。在此「who」同時作為主詞，因此後面直接接動詞「wrote」。
I wondered where she lived.
我想知道她住在哪裡。
EN： The coordinating conjunction 'so' is used to connect two independent clauses, showing a cause-and-effect relationship where the second clause is the result of the first.
中文： 對等連接詞「so」（所以）用於連接兩個獨立子句，表示因果關係，第二個子句為第一個子句所產生的結果。
The weather was bad, so we stayed indoors.
天氣很糟糕，所以我們待在室內。
EN： The modal verb 'might' is used to express weak possibility or uncertainty about a present or future situation, followed by the base form of the verb 'be'.
中文： 情態助動詞「might」（可能）用於表示對現在或未來情況較微弱的可能性或不確定推測，後接原形動詞「be」。
It is cloudy, so it might rain later.
天陰陰的，所以等一下可能會下雨。
EN： The modal verb 'couldn't' is used to express a strong negative deduction or impossibility in the past or present based on evidence.
中文： 情態助動詞 'couldn't' 用於根據現有證據，對過去或現在的事情做出強烈的否定推測或表示「不可能」。
It couldn't be Ryan's jacket; his is much larger.
那不可能是萊恩的外套；他的尺寸大得多。
EN： The subordinating conjunction 'because' is used to introduce a clause that gives the reason for the action or state in the main clause.
中文： 從屬連接詞 'because'（因為）用於引導原因從句，解釋主句動作或狀態發生的原因。
Sarah was late because she missed the bus.
莎拉遲到了，因為她沒趕上公車。
EN： In English-speaking school cultures, communication between teachers and students is often polite but can be relatively informal. However, 'casual' language (like slang or highly informal text-speak) is still generally avoided by teachers in official or written contexts, which is why the speaker deduces the note wasn't written by a teacher.
中文： 在英語系國家的校園文化中，師生之間的交流雖然客氣，但有時相對隨和。然而，教師在書面或正式場合通常仍會避免使用過於「隨性」（casual）的語言（如俚語或過度簡化的網路用語），這也是為什麼說話者會推斷這張紙條不可能是老師寫的。
EN： The modal verb 'must' is used here to express a strong logical assumption or high probability based on evidence. It translates to '一定...' (must be) in this context.
中文： 情態助動詞「must」在此處用於表示基於證據的強烈邏輯推測或高度可能性。在這種語境下，它翻譯為「一定...」。
She must be tired after the long trip.
經過長途旅行後，她一定累了。
EN： The relative pronoun 'who' introduces a defining relative clause ('who knows my schedule well') that modifies the noun 'someone'. It acts as the subject of the relative clause.
中文： 關係代名詞「who」引導一個限定修飾名詞「someone」的關係子句（who knows my schedule well）。它在關係子句中擔任主詞的角色。
I am looking for a teacher who speaks English fluently.
我正在尋找一位英語說得很流利的老師。
EN： The verb 'say' is commonly used in English to report written text, signs, or messages, where in Chinese we would typically translate it as '寫著' (written) or '寫到' (says/reads).
中文： 動詞「say」（說）在英文中常用來表達書面文字、告示或訊息的內容，在中文裡通常會翻譯為「寫著」或「寫到」，而不是「說」。
The sign says 'No Parking'.
告示牌上寫著「禁止停車」。
EN： The modal verb 'can' is used here to express ability or possibility. In the encouraging phrase 'You can do it!', it serves to motivate someone by emphasizing their capability to succeed.
中文： 情態動詞「can」在此處用於表示能力或可能性。在鼓勵的話語「You can do it!」（你做得到的！）中，它透過強調某人的能力來達到激勵的效果。
I believe you can pass the driving test.
我相信你能夠通過路考。
EN： In English-speaking school culture, it is very common for friends, classmates, or teachers to leave small encouraging notes (sometimes called 'sticky notes' or 'cheer cards') on someone's desk before a major exam or sports event to boost their morale.
中文： 在英語系國家的學校文化中，在重大考試或體育賽事之前，朋友、同學或老師很流行在彼此的書桌上留下鼓勵的小紙條（有時是便利貼或加油卡），藉此幫對方加油打氣。
EN： The modal verb 'might' is used to express weak possibility or uncertainty about a present or future situation. It is followed by the base form of the verb (in this case, 'be').
中文： 情態助動詞「might」用於表示對現在或未來狀況較弱的可能性或不確定性。其後接動詞原形（在此句中為「be」）。
It might rain later, so you should take an umbrella.
等一下可能會下雨，所以你應該帶把傘。
EN： Present participle phrases (verb-ing) can function as adjectives to modify a preceding noun. Here, 'sitting near me' is a participle phrase modifying the noun 'classmate', describing an ongoing state or action.
中文： 現在分詞短語（動詞-ing）可作為形容詞，用來修飾前面的名詞。在此處，「sitting near me」是一個分詞短語，修飾名詞「classmate」（同班同學），描述其當下的狀態或動作。
The girl standing by the door is my sister.
站在門旁邊的那個女孩是我姐姐。
EN： The modal verb 'could' is used here to express a weak or uncertain possibility in the present. It suggests that something is possible, but the speaker is not entirely sure.
中文： 情態助動詞「could」在此處用於表示現在時間裡較微弱或不確定的「可能性」。它表示某事是有可能的，但說話者並非百分之百確定。
It could rain later, so you should take an umbrella.
待會兒可能會下雨，所以你應該帶把傘。
EN： The conjunction 'since' is used to introduce a clause that gives the reason for something, functioning similarly to 'because' or 'as'.
中文： 從屬連接詞「since」在此處用於引導表示「原因」的從屬子句，功能類似於「because」（因為）或「as」（由於）。
Since we have some free time, let's grab a cup of coffee.
既然我們有些空閒時間，我們去喝杯咖啡吧。
EN： The phrasal verb 'cheer someone on' is a common expression in English-speaking cultures, reflecting a supportive and encouraging social dynamic. It is often used in both sports contexts and everyday life to show emotional support for someone's efforts.
中文： 片語動詞「cheer someone on」（為某人加油打氣）在英語系國家是非常常見的表達方式，反映了人際關係中互相支持與鼓勵的社交文化。它不僅常用於體育賽事中，也廣泛用於日常生活中，表示對他人付出的努力給予情感上的支持。
EN： The compound relative pronoun 'whoever' is used here to introduce an adverbial clause meaning 'no matter who'. It indicates that the identity of the person does not change the main fact.
中文： 複合關係代名詞「whoever」在此處引導一個讓步狀語從句，表示「不論是誰、不管是誰」。這說明該人物的具體身份並不會改變主句所描述的事實。
Whoever made this cake is a great baker.
不論是誰做了這個蛋糕，他都是個很棒的烘焙師。
EN： The modal structure 'must have + past participle' is used to express a strong logical deduction or certainty about a past event.
中文： 情態助動詞結構「must have + 過去分詞（p.p.）」用於對過去發生的事情進行強烈的邏輯推測或肯定推斷，表示「過去一定、想必已經……」。
She must have left her keys at the office.
她一定是把鑰匙忘在辦公室了。
EN： The modal verb 'can' is used here to express theoretical possibility or general truth, indicating that even small actions have the potential to produce a significant impact.
中文： 情態助動詞「can」在此處用於表示理論上的可能性或普遍真理，指出即使是微小的行動也有可能產生重大的影響。
Regular exercise can improve your health.
規律的運動可以改善你的健康。
EN： The phrase 'mean so much' uses the verb 'mean' (to have importance or value) modified by 'so much' (to a great degree) to express deep emotional significance or value.
中文： 片語「mean so much」使用動詞「mean」（具有重要性或價值），並由「so much」（極大地）修飾，用來表達深遠的情感意義或價值。
Your support means so much to our team.
您的支持對我們團隊來說意義重大。
EN： In English-speaking cultures, 'acts of kindness' (often referred to as 'random acts of kindness') are highly celebrated. There is a strong cultural emphasis on how small, everyday gestures—like holding the door or giving a compliment—can positively impact a community.
中文： 在英語系國家中，「善行」（通常被稱為「隨機善行」）非常受到推崇。文化上相當強調日常生活中微小的舉動（例如幫忙扶住門或給予讚美）如何能對社區產生積極正面的影響。
EN： The modal structure 'may have + past participle' is used to express a possibility or make a guess about a past event. It suggests that something was possible in the past, but the speaker is not 100% certain.
中文： 情態助動詞結構「may have + 過去分詞（p.p.）」用於表達對過去事件的可能性推測。這表示某事在過去是有可能的，但說話者並非百分之百確定。
She may have missed the bus this morning.
她今天早上可能錯過了公車。
EN： The word 'whole' is an adjective used before a singular noun to emphasize that the entirety of something is being referred to. It is often preceded by a possessive determiner (like 'my', 'his') or the definite article 'the'.
中文： 單字「whole」是一個形容詞，置於單數名詞前，用以強調指的是某事物的全部（整個）。它前面通常會加上所有格限定詞（如「my」、「his」）或定冠詞「the」。
He ate the whole cake by himself.
他自己一個人吃掉了整個蛋糕。
EN： In English-speaking cultures, leaving anonymous encouraging notes (like 'You can do it!') is a common, warm gesture of kindness in schools and workplaces to boost morale. The phrase 'changed my whole day' is a common idiom meaning a small positive event completely turned a bad or mediocre day into a great one.
中文： 在英語系國家的文化中，留下匿名的鼓勵紙條（例如「You can do it!」）是學校和職場中常見且溫馨的善意舉動，用以激勵士氣。片語「changed my whole day」是一個常見的慣用語，意指一個小小的正面事件，徹底將原本糟糕或平淡的一天變成了美好的一天。
EN： An indirect question is a question embedded inside another statement or question (e.g., 'who sent it' inside 'I still don't know...'). Unlike direct questions, indirect questions use statement word order (subject + verb) rather than question word order.
中文： 間接問句是嵌入在另一個陳述句或問句中的問句（例如在 'I still don't know...' 中的 'who sent it'）。與直接問句不同，間接問句使用陳述句的語序（主詞 + 動詞），而非疑問句語序。在此句中，who 同時作為疑問詞與該子句的主詞，後面直接接動詞 sent。
Do you know where she lives?
你知道她住哪裡嗎？
EN： The coordinating conjunction 'but' is used to connect two independent clauses that present contrasting ideas. In this sentence, it connects 'I still don't know who sent it' with 'I am grateful'.
中文： 等立連接詞「but」（但是）用於連接兩個呈現對比概念的獨立子句。在本句中，它將「我仍然不知道是誰寄的」與「我很感激」這兩個完整的想法連接起來。
The test was difficult, but he passed it.
考試很難，但他通過了。
EN： The word 'whose' is an interrogative possessive determiner used to ask who owns something. It is followed directly by the noun it modifies (e.g., 'whose phone').
中文： 單字「whose」是疑問所有格限定詞，用於詢問某物歸誰所有。它後面會直接接上所修飾的名詞（例如：「whose phone」，意為「誰的電話」）。
Whose car is parked outside?
誰的車停在外面？
EN： The present continuous tense ('is ringing') is used to describe an action that is happening right now at the moment of speaking.
中文： 現在進行式（「is ringing」）用於描述在說話當下正在發生的動作。
The baby is sleeping in the room.
寶寶正在房間裡睡覺。
EN： In English-speaking cultures, calling someone by their first name (like 'Emma') at the end of a question is a common way to get their attention directly and friendly, especially in casual settings.
中文： 在英語系國家中，在問句句尾直接稱呼對方的名字（如「艾瑪」）是日常生活中非常常見且親切的溝通方式，能直接吸引對方的注意。
EN： The modal verb 'might' is used to express weak possibility or uncertainty about a present or future situation. It is less certain than 'may' or 'must'.
中文： 情態助動詞「might」用於表示對現在或未來狀況的微弱可能性或不確定性。其確定性低於「may」或「must」。
It might rain later, so you should take an umbrella.
等一下可能會下雨，所以你應該帶把傘。
EN： The phrasal verb 'step out' means to leave a room or building for a short period of time, often used in casual or professional contexts.
中文： 片語動詞「step out」意為暫時離開房間或建築物，常用於日常口語或職場情境中。
Mr. Green just stepped out for a cup of coffee.
格林先生剛走出去買杯咖啡。
EN： In Western office and school culture, 'stepping out' is a very common, polite way to say someone has temporarily left their desk or room (e.g., to use the restroom, grab a drink, or take a quick call) but will return shortly.
中文： 在西方辦公室與學校文化中，「stepping out」是一個非常常見且禮貌的表達方式，用來表示某人暫時離開座位或房間（例如去洗手間、拿飲料或接個簡短電話），但很快就會回來。
EN： The modal verb 'can't' (cannot) is used to express a strong negative deduction or certainty about a present situation, meaning 'it is impossible that...'.
中文： 情態助動詞 'can't'（不能、不可能）用於表示對目前狀況的強烈否定推測或肯定，意思是「不可能...」。
That can't be the correct answer; it doesn't make sense.
那不可能是正確答案；這根本說不通。
EN： Possessive pronouns (such as 'mine', 'yours', 'his', 'hers', 'ours', 'theirs') are used to replace a possessive adjective + noun combination to avoid repetition. Here, 'mine' replaces 'my phone'.
中文： 所有格代名詞（如 'mine'、'yours'、'his'、'hers' 等）用於代替「所有格形容詞 + 名詞」的組合以避免重複。在此處，'mine' 代替了 'my phone'（我的手機）。
Your car is fast, but mine is more comfortable.
你的車很快，但我的（車）比較舒適。
EN： The modal verb 'must' is used here to express strong logical deduction or certainty based on evidence. It translates to '一定' (must be) in this context.
中文： 情態助動詞「must」在此處用於表示基於證據的強烈邏輯推論或肯定。在這種語境下，它翻譯為「一定（是）」。
She has been working all day, so she must be tired.
她工作了一整天，所以她一定累了。
EN： The coordinating conjunction 'so' is used to introduce a clause showing the result or consequence of the preceding statement.
中文： 對等連接詞「so」用於引導一個子句，以表示前述陳述的結果或影響（意為「所以」）。
It was raining, so we stayed indoors.
下雨了，所以我們待在室內。
EN： The modal verb 'could' is used to express possibility or uncertainty in the present or future. It suggests that something is possible, but not certain, similar to 'might' or 'may'.
中文： 情態助動詞「could」在此處用於表示現在或未來的可能性或不確定性。它表示某事是有可能的，但並不完全確定，語氣比「must」更為委婉，類似於「might」或「may」。
The keys could be in your coat pocket.
鑰匙可能在你的外套口袋裡。
EN： The word 'outside' can function as an adverb or an adjective. In this sentence, it acts as an adjective modifying the noun 'wind', indicating the location of the wind relative to the speaker.
中文： 單字「outside」可以作為副詞或形容詞使用。在本句中，它作為後置形容詞修飾名詞「wind」（風），指出風相對於說話者的位置（外面的）。
The noise outside woke me up.
外面的噪音把我吵醒了。
EN： The modal verb 'must' is used here to express a strong logical deduction or certainty based on evidence. When combined with the base verb 'be' ('must be'), it indicates that the speaker is almost sure about a present state.
中文： 情態助動詞「must」在此處用於表示基於證據的強烈邏輯推測或肯定。當與原形動詞「be」結合（must be）時，表示說話者對目前的狀態幾乎可以肯定（譯為「一定...」）。
He must be hungry after working all day.
工作了一整天，他現在一定很餓。
EN： The preposition 'after' is used to indicate that one event or state follows another in time. In this sentence, it connects the state of being tired to the preceding long trip.
中文： 介係詞「after」用於表示一個事件或狀態在時間上接續在另一個之後。在本句中，它將「疲累」的狀態與先前的「長途旅行」連結起來（譯為「在...之後」）。
We went for a walk after dinner.
我們晚餐後去散步了。
EN： The modal verb 'might' is used to express weak possibility (something that is possible but not certain). To make it negative, we add 'not' directly after 'might' ('might not'). Unlike verbs like 'do' or 'can', modal verbs do not change form for different subjects.
中文： 情態助動詞「might」用於表示微弱的可能性（可能發生但並不確定）。若要形成否定句，直接在「might」後面加上「not」（might not）。與一般動詞不同，情態助動詞不會隨著主詞的人稱而改變形式。
She might not come to the party tonight.
她今晚可能不會來參加派對。
EN： The adverb 'yet' is commonly used in negative sentences to indicate that something has not happened up to the present time, though it is expected to happen in the future. It is usually placed at the end of the sentence.
中文： 副詞「yet」常用於否定句中，表示某事直到目前為止尚未發生，但預期未來會發生。它通常放在句子的末尾，中文常譯為「還（沒）」。
They have not finished their homework yet.
他們還沒有完成他們的作業。
EN： The modal verb 'can't' (cannot) is used to express negative deduction or strong disbelief. When we are almost 100% sure that something is impossible based on evidence, we use 'can't be' followed by an adjective or noun.
中文： 情態助動詞 'can't'（cannot）用於表示否定的推測或強烈的不相信。當我們根據證據幾乎百分之百確定某事是不可能的時候，我們會使用 'can't be' 後接形容詞或名詞。
It can't be Ryan's jacket; his is much larger.
這不可能是萊恩的外套；他的外套大得多。
EN： The linking verb 'sound' is used to express an impression based on what has been heard or said. It is followed directly by an adjective (e.g., 'sounds impossible') to describe the subject.
中文： 連綴動詞 'sound'（聽起來）用於表達根據所聽到的內容或說法所產生的印象。其後直接接形容詞（例如 'sounds impossible'）來修飾主詞。
That sounds great! Let's do it.
那聽起來棒極了！我們做吧。
EN： The modal verb 'must' is used here to express strong deduction or logical necessity, meaning 'it is highly likely or certain that something is the case' based on available evidence.
中文： 情態助動詞「must」在此處用於表示強烈的推論或邏輯上的必然性，意思是根據現有證據「某事極有可能是真的」或「必定如此」。
He must be tired after the long trip.
長途旅行後他一定累了。
EN： The passive voice 'be hidden' (be + past participle) is used to focus on the receiver of the action (the answer) rather than the agent who hid it.
中文： 被動語態「be hidden」（be 動詞 + 過去分詞）用於將焦點放在動作的接受者（答案）上，而不是隱藏答案的人。
The key must be hidden under the doormat.
鑰匙一定被藏在門墊下面。
EN： The structure 'Let's + base verb' (short for 'let us') is used to make suggestions or proposals, inviting others to do an action together.
中文： 「Let's + 原形動詞」（為 let us 的縮寫）用於提出建議或提議，邀請他人一同參與某個行動。
Let's start the meeting now.
我們現在開始開會吧。
EN： The word 'before' acts as a conjunction here, introducing an adverbial clause of time ('before we guess') to indicate that the action in the main clause should happen first.
中文： 「before」在此處作為連接詞，引導時間副詞子句（before we guess），用以表示主句的動作應該先發生。
Wash your hands before you eat.
吃東西前要先洗手。
重要單字附有 IPA 發音、定義、例句和互動式測驗。
在本文中： 屬於，歸…所有
在本文中： 發出嘎啦嘎啦的響聲
在本文中： 線索，提示
在本文中： 納悶，想知道
在本文中： 整潔的，工整的
在本文中： 非正式的，隨意的
在本文中： 日程表，計畫表
在本文中： 感激的，表示感謝的
片語包含類型標示、雙語定義、用法說明和例句。
To be the property of someone.
屬於…所有
To search for someone or something.
尋找
To leave a room or building for a short time.
暫時離開，出去一下