高中英語語法總結(jié)：It句型

1.It's time(for sb.)to do sth./It's time for sth.譯為“是(某人)該干……的時間了”、“到……的時候了”。如：

It's time for supper /to have supper.

2.It takes(sb.)some time to do sth.譯為“(某人)花……時間做某事”。如：

It took me a week to finish reading the book.

3.It is one's turn to do sth.表示“輪到某人做某事”。如：

It's your turn to be on duty tomorrow.

4.It is /has been +時間段+since +一般過去時。譯為“自從……以來已過了……(時間)”。此結(jié)構(gòu)可以與另一種句型進行同義句轉(zhuǎn)換。如：

It has been two weeks since we met last.=Two weeks has passed since we met last.

5.It seems /seemed +that從句。譯為“看起來好像……”，此結(jié)構(gòu)可以轉(zhuǎn)換成“seem +不定式”形式。如：

It seems that he is ill.=He seems to be ill.

6.It's+adj.+of/forsb.+不定式。對于這個句型究竟用of還是用for，上面許振鐸老師的文章中已有論述。這里再強調(diào)一下：如果形容詞是描述不定式行為者的性格、品質(zhì)的，如：kind，good，nice，clever等用of;如果僅僅是描述事物的形容詞，如：difficult，easy，hard， important，dangerous等則用for。如：

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

It's important for him to learn English well.

7.It's+表語 +to do sth.。如：

It's a good idea to go out for a walk.=To go out for a walk is a good idea.

8.It's+adj.+ that從句。如：

It's true that he may fall behind the other students.