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关于英文when的词性

1、[adv.]

(1)[疑问副词]什么时候，何时，在什么情况下；

用于疑问句首，如 When do you begin your classes?

(2)从前，以前；当年: When you were a child, you didn't know what it means.

(3)在……时候：His wife always complains when he smoke.

(4)[关系副词]彼时，其时:Where when he knows wrong, he doesn't admit.

2、[conj.](常用于连接两件事)

(1)什么时候：He told us when to eat.

(2)届时，在那时：He came at six, when the sun was setting.

(3) 是……的时候了：He came at a time when we needed help.

(4)当……时，在……的时候：When we are at college.

(5)每逢，每当：She smiles when you praise her.

(6)相反，而，却：To complain of one's lot when one might change it.(本来可以改变自己的命运，却自怨命苦。)

(7)既然，鉴于：How can he help when they won't let him.

3、[pron.]

什么时候(常用于定语从句)：It was in the morning, when he died.

4、[n.]

时间：When in doubt, leave out.