when是什么意思

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

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.

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