It is very clear that hes round and tall like a tree.

= That hes round and tall like a tree is very clear.

4. It is important ( necessary， right， strange， natural) that

该句型和上一个同属一个句型。由于主句中的形容词不同，that 后的从句中要用虚拟语气(should + 动词原形)，should 可以省去。建议记住该句型中的形容词。

It is important that we (should) learn English well.

It is necessary that he (should) remember these words.

5. It is said (reported， learned) that

该句型中的it 仍是形式主语，真正主语是that 引导的主语从句。该结构常译为据说(据报道，据悉)。

It is said that he has come to Beijing.

It is reported that another earth satellite has been put into orbit.

6. It is suggested ( ordered ) that

该句型和上一个同属一个句型。主句中的过去分词是表示请求，建议，命令等词时，that后的从句要用虚拟语气(should + 动词原形)，should 可以省。常译为据建议;有命令)

It is suggested that the meeting ( should ) be put off.

It was ordered that we ( should ) arrive there in two hours.

7. It is a pity ( a shame ) that

该句型中，that后的从句一般用虚拟语气(should + 动词原形)，should可省去。表示出乎意料，常译为竟然。没有这种意义时，则不用虚拟语气。

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