③It is＋过去分词(known，said，believed，hoped，reported，proved，discussed，etc.)＋that从句

　　It is said that the sports meeting will be put off.

　　据说运动会会推迟。

　　④It＋特殊动词(seem，appear，turn out，happen，occur to sb etc.)＋that从句

　　It appears that he followed my advice.

　　他好像听从了我的建议。

　　⑤It＋does not matter(make no difference，etc.)＋连接代词或连接副词引起的主语从句。

　　It makes no difference where they have the meeting.

　　他们在哪里开会毫无区别。

　　(3)主语从句的虚拟语气

　　①It is＋过去分词(advised，asked，argued，decided，demanded，desired，determined，ordered，proposed，recommended，requested，suggested，etc.)＋that从句，从句谓语动词用should do，should常省略。

　　It is suggested that we(should)take the bus.

　　人们建议我们乘坐公交车。

　　②It is/was＋形容词(important，natural，necessary，strange，etc.)＋that从句，从句谓语动词多用should＋do，should常省略。

　　It is quite natural that he(should)not help her with her work.

　　他没帮助她工作是很自然的。

　　(4)主语从句和表语从句都必须用陈述语序

　　What we need is more practice.

　　我们需要的是更多的实践。

　　The question is how we can get in touch with him.

　　问题是我们怎样和他取得联系。

　　即时跟踪2　用适当的连接词填空

1．It's a good thing that the exams are finished.