When did he go?他什么时候离开的？

When is the press conference?记者招待会何时举行？

When were you in this house last?你上次待在这所房子是什么时候？

I'll be there this afternoon.—When?我今天下午会到那儿。——什么时候？

She was reading when I came in.我进来的时候她正在读书。

I met my wife four years ago when her daughter was nine.四年前我遇到我妻子的时候, 她的女儿九岁。

I'll have a talk with you when I get back.我一回去就会找你谈话。

When we'd crossed the border, we started to relax.一穿过边境, 我们便放松下来。

When he brought Imelda her drink, she gave him a smile.当他把饮料拿给伊梅尔达时, 她朝他笑了笑。

I'll start to think about it when I have to write my report.我要写报告时会对此予以考虑的。

It's not easy when you're a teenager.这对于十来岁的孩子来说不容易。

It does not produce hydrogen when added to dilute acids.加入到稀酸时不会产生氢气。

When making pastry, always handle the ingredients as little as possible.做油酥点心时要尽量少触碰调料。

I don't know when the decision was made.我不知道这个决定是什么时候做的。

It is important to check when the laboratory can do the tests.核实一下实验室何时可以进行这些测试很重要。

How can I love myself when I look like this?我这个样子, 怎么能对自己满意呢？

How did you pass the exam when you'd not worked for it?你都没有下功夫, 怎么可能通过考试？

I thought I was wrong when in fact I was right.我认为自己错了, 而事实上我是对的。

on the day when I met him在我见到他那天

He could remember a time when he had worked like that himself.他还能记得自己一度工作起来也是那个样子。