I found it impossible for me to work out all the problems in such a short time.
20. It is + time since
我从这所学校毕业已经十年了。
It is ten years since I graduated from this school.
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 oclock when I got to the cinema.
我离开医院时已经是半夜了。
It was midnight when I left the hospital.
22. It is + time before
不久我们就会再见面的。
I wont be long before we can meet again.
两年之后我们才能知道它是否有效。
It will be two years before we know whether it is effective.
23. It isthat
我最珍视的是友谊。
It is friendship that I value most.
直到许多小工厂关闭了,这条河才又变得清澈起来。
It was not until the small factories were shut down that the river became clean again.
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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