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（1）It is＋名词+从句：
It is a fact that…事实是……
It is a question that………是个问题
It is good news that………是好消息
It is common knowledge………是常识
(2) It is＋过去分词+从句：
It is said that…据说……
It must be pointed out that…必须指出……
It is asserted that…有人主张……
It is supposed that…据推测……
It is believed that…据信……
It must be admitted that…必须承认……
It is reported that…据报道……
It will be seen from ii that…由此可见……
It has been proved that…已证明……
It is general1y considered that…人们普遍认为……
（3）It is＋形容词+从句：
It is necessary that…有必要……
It is likely that…很可能……
It is clear that…很清楚……
It is important that…重要的是……
(4) It＋不及物动词十从句：
It follows that…由此可见……
It happens that…碰巧……
It turned out that…结果是……
It is a fact that…事实是……
It is a question that………是个问题
It is good news that………是好消息
It is common knowledge………是常识
(2) It is＋过去分词+从句：
It is said that…据说……
It must be pointed out that…必须指出……
It is asserted that…有人主张……
It is supposed that…据推测……
It is believed that…据信……
It must be admitted that…必须承认……
It is reported that…据报道……
It will be seen from ii that…由此可见……
It has been proved that…已证明……
It is general1y considered that…人们普遍认为……
（3）It is＋形容词+从句：
It is necessary that…有必要……
It is likely that…很可能……
It is clear that…很清楚……
It is important that…重要的是……
(4) It＋不及物动词十从句：
It follows that…由此可见……
It happens that…碰巧……
It turned out that…结果是……
