1. It is/was +名词+从句

It is a _____ that... 事实是...... fact

___ is good news that ... ......是好消息 It

It is __________ that ... ......是个问题 a question

____ is common knowledge that ... ......是常识 It

类似的名词还有：a pity；a wonder；a good thing； no wonder； surprise等。

It is a mystery to me _____ it all happened. 这一切是怎么发生的是个谜。 how

It is common knowledge______ the whale is not a fish. 鲸鱼不是鱼，这是常识。that

It is no surprise _____Bob should have won the game. 鲍勃会赢得这场比赛，这不足为that

2. It is/was +形容词+从句

It is__________ that ... 有必要...... necessary

It is _______that ... 很清楚...... clear

It is _______ that ... 很可能...... likely

It is _________ that ... 重要的是...... important

类似的形容词还有：strange; natural; obvious; true; good; wonderful; possible; unlikely; quite; unusual; certain; evident; worth-while; surprising; interesting; astonishing, etc.

1) ______________________ conductors and insulators are both important in industry.

It is obvious that

　很明显导体和绝缘体在工业中都很重要。

2) _____________________ she will be able to come. It is doubtful whether

她是否能来令人怀疑。

3) ___________________________ that he re fused to talk to you. It was really astonishing

他拒绝和你说话真是令人惊讶。

4) _____________________________ he should be here by the weekend. It is essential that

周末之前，他应该到这里是必要的。

5) _________________________ we can not go on like this. It seems/is obvious that

很明显我们不能这样下去了。

3. It is/was +过去分词+从句

据说......______________________ 据报道......_______________________

已证明......_______________________ 必须指出...______________________