when

Definition

• adv. At what time; -- used interrogatively.
• adv. At what time; at, during, or after the time that; at or
• just after, the moment that; -- used relatively.
• adv. While; whereas; although; -- used in the manner of a
• conjunction to introduce a dependent adverbial sentence or clause,
• having a causal, conditional, or adversative relation to the principal
• proposition; as, he chose to turn highwayman when he might have
• continued an honest man; he removed the tree when it was the best in
• the grounds.
• adv. Which time; then; -- used elliptically as a noun.

Example sentences

1. conj.

   I like to listen to music when I study.

2. adv.

   Do you know when the meeting will start?

3. pron.

   When is your birthday?

4. n.

   I need more time to finish my project.