(1).It is adj.+ to do sth.
It is difficult to translate this article.
翻译这篇文章很难。
(2).It is adj. + for/of sb.+ to do sth.
It is important for us to learn English.
学习英语对我们很重要。
It’s kind of you to help me.
你帮助我真是太好了。
(3)It is up to sb. to do sth.“应由某人负责”或“……是某人的职责”。
It’s up to you to decide whether to take the job or not. 接不接受这份工作由你自己定。
(4)It is adj.+ that clause
It is important that we should pay close attention to grain. 关注粮食对我们很重要。
(5)It is (no) good/use/useless + doing sth.
It is no use trying again = It is of no use to try again.
再试也没用。
(6)It is worthwhile + doing sth./to do sth.
It is worthwhile spending/to spend much time on it.
在这件事上花时间是值得的。
(7)It happens + that clause
It happened that John was the only witness.
碰巧约翰是唯一的证人。
(8)It occurs to/strikes sb.+thatclause 某人突然想到……
It suddenly occurred to/struck me that I hadn’t seen Peter all day.
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