when

[wen]

adv.什么时候, 当 ... 时
conj.然后, 可是, 当 ... 时
pron.什么时候
n.时间

例句与用法：

The Queen's last visit was in May, when she opened the new hospital.

女王上次来访是在五月份，她那时主持了这座医院的落成典礼。

How can they learn anything when they spend all their spare time watching television?

他们把所有的空闲时间都用来看电视了，还能学什麽东西呢？

It was the sort of morning when everything goes wrong.

那天上午就是那样，事事不顺心。

It was raining when we arrived.

我们到的时候正在下雨。

He was fond of drawing when he was a child.

他还是个孩子时就喜欢画画。

Turn off the switch when anything goes wrong with the machine.

如果机器出故障，就把开关关掉。

When did that happen?

那件事是什么时候发生的？

词形变化：

动词过去式: whelmed | 动词过去分词: whelmed | 动词现在分词: whelming | 动词第三人称单数: whelms |

详细释义：

ad.

1. (用作疑问副词)什么时候, 何时

I'd like to know when they'll let him out.

我想知道他们什么时候放他。

When did you last see Margaret?

你上一次见到玛格丽特是什么时候?

2. (用作关系副词, 引导关系从句)当……时

There were times when I didn't know what to do.

有些时候我不知道该怎么办才好。

conj.

1. 当……时

John got engaged to her when travelling last winter.

去年冬天旅行时, 约翰与她订了婚。

Don't get excited when you talk.

你说话时别激动。

2. 既然, 考虑到

How can he get the promotion when his boss dislikes him?

既然上司不喜欢他, 那他怎么会获得提升呢?

3. 虽然, 然而

I had only fifteen dollars on me when the book I wanted cost twenty.

我身上只带了十五美元, 可是我想买的那本书定价二十美元。

4. 在那时, 然后

pron.

什么时候, 那时

Since when has she taught here?

她从什么时候开始在这儿教书的?

n.

(事件发生的)时间[the S]