When did you see him last?你上次是什么时候见到他的?
I'd like to know when they will let him out.我想知道他们什么时候能让他出去。
I don't know when to start.我不知道何时开始。
This is the hour when the place is full of people.这种时候这地方到处都是人。
We will put off the meeting till next week,when we will be all here.会议将推迟到下周,那时我们都在这儿。
That was when I was eight.那是我八岁时的事情了。
Often she will weep when alone.她一个人时常哭。
When he comes I'll tell him to fetch the police.他来的时候我将让他去喊警察来。
I was walking along the street when someone called me from behind.我正沿着街道走时,忽然后面有人喊我。
When the weather is good,I usually go to the country.若是天气好的话,我总是到乡下去。
Hardly had I opened the door when I hit him.我刚刚打开门就撞到他。
He sold it for 10 dollars when everyone else sold it for 12.别人卖12元,他却卖10元
词语辨异
when, as, while 参见as条。
学习参考
when有时也可用作疑问代词或关系代词,作介词或动词的宾语。例如:
We'll get there heaven knows when.天知道我们什么时候才能到达那里。
Next summer,by when the house should be ready.到明年夏天房子就准备好了。