16. not…until

直到他告诉我发生的事，我才了解真相。

I didn’t know the truth until she told me what happened。

17. as if

他夸夸其谈好像什么事都知道。

He talks a lot as if he knows everything。

18. It is no use (good) doing…

假装不懂规则是行不通的。

It’s no use pretending that you didn’t know the rules。

19. find it + adj to do…

我觉得作听力时有必要作笔记。

I find it necessary to take down notes while listening。

20. It is + time since…

我已经有两年没见他了。

It is two years since I last met him。

21. It is + time when…

我到电影院时已经八点钟了。

It was 8 o’clock when I got to the cinema。

22. It is + time before…

不久我们就会再见面的。

I won’t be long before we can meet again。

23. It is…that…

我最珍视的是友谊。

It is friendship that I value most。

24. It is + n / adj + that / to do…

每个人都必须懂得如何使用计算机

It is a must that everybody should know how to use computers。

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