when词性有副词、介词、连词和名词四种。

when，英语。

[英][wen] [美][wɛn]

adv.什么时候; （用于时间的表达方式之后）在那时; 其时; 当时;

conj.在…时; 既然; 如果;

pron.什么时候; 那时;

n.时间，时候; 日期; 场合。

扩展资料

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