it is important that...句型中,it为形式主语,that从句为真正的主语。常用于这种结构的形容词有:clear,strange,obvious,certain,important,possible,natural,surprising,interesting,likely,unusual等。
在it is necessary/important/strange/natural/impossible/essential/a pity...+that...中,从句中的谓语动词常用“should+动词原形”,should可省略。
It is obvious that she is popular with students.
很明显,她很受学生们的欢迎。
It is important that we (should) discuss the plan.
重要的是我们该讨论这个计划。
夯实基础
同义句改写
It is necessary that he should be sent there at once.(用不定式改写句子)
It_is_necessary_for_him_to_be_sent_there_at_once.
Ⅰ.单项填空
1.________ is not necessary for you to have told her about the bad news.
A.There
B.It
C.That
D.This
答案 B
解析 考查固定句型It is necessary for sb.to do...。
2.It is very important that one ________ the skills of computers.
A.master
B.masters
C.will master
D.has mastered
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