17. It is + time since
我已经有两年没见他了。
It is two years since I last met him.
18. It is + time when
我到电影院时已经八点钟了。
It was 8 oclock when I got to the cinema.
19. It is + time before
不久我们就会再见面的。
I wont be long before we can meet again.
20. It isthat
我最珍视的是友谊。
It is friendship that I value most.
21. 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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