高中英语语法解析：IT句型

1.Its time（for sb.）to do sth./Its time for sth.

译为“是（某人）该干……的时间了”、“到……的时候了”。如：

Its time for supper /to have supper.

2.It takes（sb.）some time to do sth.

译为“（某人）花……时间做某事”。如：

It took me a week to finish reading the book.

3.It is ones turn to do sth.

表示“轮到某人做某事”。如：

Its your turn to be on duty tomorrow.

4.It is /has been +时间段+since +一般过去时。

译为“自从……以来已过了……（时间）”。

此结构可以与另一种句型进行同义句转换。如：

It has been two weeks since we met last.

=Two weeks has passed since we met last.

5.It seems /seemed +that从句。

译为“看起来好像……”，此结构可以转换成“seem +不定式”形式。如：

It seems that he is ill.

=He seems to be ill.

6.Its+adj.+of/forsb.+不定式。

这里再强调一下：如果形容词是描述不定式行为者的性格、品质的，如：kind，good，nice，clever等用of；如果仅仅是描述事物的形容词，如：difficult，easy，hard， important，dangerous等则用for。如：

It was very kind of you to visit me when I was ill.

Its important for him to learn English well.

7.Its+表语 +to do sth.。如：

Its a good idea to go out for a walk.

=To go out for a walk is a good idea.

8.Its+adj.+ that从句。如：

Its true that he may fall behind the other students.