Period Four　Grammar-The use of "it"(1)

感知以下课文原句，补全方框下的小题

1．It is a beautiful day here and I am sitting under the big tree at the end of the garden.

2．It seems amazing that at my age I am still fit enough to cycle 20 kilometres in an afternoon.

3．It is my birthday in two weeks' time and I'll be 82 years old!

4．Your mother tells me that you started smoking some time ago and now you are finding it difficult to give it up.

5．Believe me，I know how easy it is to begin smoking and how tough it is to stop.

6．This means that after a while your body becomes accustomed to having nicotine in it.

7．As you know，if you do the same thing over and over again，you begin to do it automatically.

8．I didn't know，for example，that it could do terrible damage to your heart and lungs or that it was more difficult for smoking couples to become pregnant.

1．it可以用作非人称代词，指代天气，如句1；也可以指代时间，如句3。

2．it用作非人称代词时，可以指代前面所说的部分内容或某个东西，如句4中的第二个it、句6、句7和句8中的第一个it。

3．it可以代替主语从句，作形式主语，如句2；也可代替不定式作形式主语，如句5和句8中的第二个it。

4．it可以代替不定式作形式宾语，如句4中的第一个it。

一、it 作人称代词

1．it的最基本用法是作代词，主要指上文提到的事物，以避免重复：

Xi'an is a beautiful city，isn't it?

西安是个美丽的城市，不是吗？

2．也可以指动物、婴儿(未知性别的婴儿或孩子)或不明身份的人：

-Is this your dog?

-No，it isn't.