when

conj. 当...的时候 adv. 何时, 什么时候 pron. 什么时侯 n. 时间

Detailed Explanations:

• 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.