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it是个很常见的单词，但要把它使用好却不是一件容易的事。现将其用法归纳如下。
1. it可以用来指代上文中提到的同一个“人或物”。例如：
There is a pen on the desk. It’s mine. 桌子上有一支钢笔，那支钢笔是我的。
2. it可以用来指代一个身份不定、姓名不详的人。例如：
—Who is it knocking at the door？谁在敲门呀？
—Me. 是我。
3. it可以用来指代时间、天气、距离等。例如：
It’s ten o’clock，so I must go. 十点钟了，我该走了。
It’s fine today，isn’t it？今天天气很好，是吗？
It’s five miles away from my home to our school. 从我家到学校有5英里远。
4. it可以用来指代“小孩”，尤其指婴儿。例如：
Her baby is nine months old，and it looks lovely. 她的孩子九个月了，看起来很可爱。
5. it可以用作形式主语或者形式宾语。例如：
It is too difficult for me to finish the work in two hours. 两个小时内完成这项工作对我来说太难了。
I found it easy to collect money for the people in Sichuan earthquake striken-areas. 我发现为四川地震灾区的人民募捐很容易。
6. it可以帮助构成强调句式。例如：
It is only in this way that we can defeat the earthquake in Wenchuan. 只有这样我们才能战胜汶川地震灾害。
7. it可以附在一些动词后构成固定结构。例如：
I hope you’ll make it soon. 我希望你很快就会成功。
巩固练习：
1. I like_______ here when I feel the warm sunshine and soft sands.
A. it B. these C. that D. this
2. We live in a world in which only the strongest can make_______ to the top.
A. it B. one C. him. D. this.
3. We all take_______ for granted that heavy objects fall faster than light ones.
A. that B. one C. this D. it
4._______ is no use_______ without doing anything.
A. This； saying B. It； say
C. That； to say D. It； saying
5. I try to find_______ that prevents so many people from taking part in the program.
A. what it is B. why it is
C. what it does D. why it does
Key：1-5 AADDA
1. it可以用来指代上文中提到的同一个“人或物”。例如：
There is a pen on the desk. It’s mine. 桌子上有一支钢笔，那支钢笔是我的。
2. it可以用来指代一个身份不定、姓名不详的人。例如：
—Who is it knocking at the door？谁在敲门呀？
—Me. 是我。
3. it可以用来指代时间、天气、距离等。例如：
It’s ten o’clock，so I must go. 十点钟了，我该走了。
It’s fine today，isn’t it？今天天气很好，是吗？
It’s five miles away from my home to our school. 从我家到学校有5英里远。
4. it可以用来指代“小孩”，尤其指婴儿。例如：
Her baby is nine months old，and it looks lovely. 她的孩子九个月了，看起来很可爱。
5. it可以用作形式主语或者形式宾语。例如：
It is too difficult for me to finish the work in two hours. 两个小时内完成这项工作对我来说太难了。
I found it easy to collect money for the people in Sichuan earthquake striken-areas. 我发现为四川地震灾区的人民募捐很容易。
6. it可以帮助构成强调句式。例如：
It is only in this way that we can defeat the earthquake in Wenchuan. 只有这样我们才能战胜汶川地震灾害。
7. it可以附在一些动词后构成固定结构。例如：
I hope you’ll make it soon. 我希望你很快就会成功。
巩固练习：
1. I like_______ here when I feel the warm sunshine and soft sands.
A. it B. these C. that D. this
2. We live in a world in which only the strongest can make_______ to the top.
A. it B. one C. him. D. this.
3. We all take_______ for granted that heavy objects fall faster than light ones.
A. that B. one C. this D. it
4._______ is no use_______ without doing anything.
A. This； saying B. It； say
C. That； to say D. It； saying
5. I try to find_______ that prevents so many people from taking part in the program.
A. what it is B. why it is
C. what it does D. why it does
Key：1-5 AADDA