登录
3. It was fun to decorate your room last month. 关于it作形式主语，你了解多少？
It is important to learn a foreign language well. 学好一门外语很重要。
It took us a long time to finish the work.
完成这项工作花费了我们很长时间。
It will be great to go on a picnic this weekend. 这个周末去野餐将会很棒。
总结: 当动词不定式(to do形式)作主语时，为了避免句子头重脚轻，通常用it作形式主语，而把真正的主语(动词不定式)放在句子后面。
【即学即练】在空白处填入一个适当的单词或括号内所给词的适当形式，将下文补充完整。
Doing chores is an important part of our life. For example, (1) is necessary to clean our rooms regularly(经常地). A clean room can make us feel comfortable and happy. But it is not easy (2) (do) common chores, such as washing dishes and sweeping the floor every day. And it is (3) (help) to take out the rubbish in time. If we don't, our house may smell bad. What's more, it is a good way (4) (build) the strong family relationship by sharing chores. Through doing these chores, we can not only keep our home clean and tidy but also learn some useful life skills.
It is important to learn a foreign language well. 学好一门外语很重要。
It took us a long time to finish the work.
完成这项工作花费了我们很长时间。
It will be great to go on a picnic this weekend. 这个周末去野餐将会很棒。
总结: 当动词不定式(to do形式)作主语时，为了避免句子头重脚轻，通常用it作形式主语，而把真正的主语(动词不定式)放在句子后面。
【即学即练】在空白处填入一个适当的单词或括号内所给词的适当形式，将下文补充完整。
Doing chores is an important part of our life. For example, (1) is necessary to clean our rooms regularly(经常地). A clean room can make us feel comfortable and happy. But it is not easy (2) (do) common chores, such as washing dishes and sweeping the floor every day. And it is (3) (help) to take out the rubbish in time. If we don't, our house may smell bad. What's more, it is a good way (4) (build) the strong family relationship by sharing chores. Through doing these chores, we can not only keep our home clean and tidy but also learn some useful life skills.
答案
1. it 2. to do 3. helpful 4. to build
解析
【分析】
本题围绕it作形式主语的语法展开，需结合固定句型、词形变化解题：第1空需用it作形式主语替代后面的不定式主语；第2空对应固定句型“it is + adj + to do sth”；第3空需将动词转换为形容词作表语；第4空对应“a way to do sth”的固定结构。
【解析】
1. 第1空：考查it作形式主语的用法，真正主语是“to clean our rooms regularly”，为避免句子头重脚轻，用it代替真正主语，故填it；
2. 第2空：固定句型“it is + 形容词 + to do sth”中，it是形式主语，真正主语是后面的不定式，故填to do；
3. 第3空：“it is + 形容词”结构中需用形容词作表语，动词help的形容词形式是helpful，故填helpful；
4. 第4空：“a way to do sth”表示“做某事的方法”，不定式作后置定语修饰way，故填to build。
【答案】1. it 2. to do 3. helpful 4. to build
【知识点】it作形式主语、形容词转换、不定式的用法
【点评】本题聚焦初中英语核心基础语法，涵盖it作形式主语的常见结构、词形转换等考点，难度较低，熟练掌握相关固定搭配即可正确作答，是巩固语法知识的典型练习题。
【难度系数】0.7
本题围绕it作形式主语的语法展开，需结合固定句型、词形变化解题：第1空需用it作形式主语替代后面的不定式主语；第2空对应固定句型“it is + adj + to do sth”；第3空需将动词转换为形容词作表语；第4空对应“a way to do sth”的固定结构。
【解析】
1. 第1空：考查it作形式主语的用法，真正主语是“to clean our rooms regularly”，为避免句子头重脚轻，用it代替真正主语，故填it；
2. 第2空：固定句型“it is + 形容词 + to do sth”中，it是形式主语，真正主语是后面的不定式，故填to do；
3. 第3空：“it is + 形容词”结构中需用形容词作表语，动词help的形容词形式是helpful，故填helpful；
4. 第4空：“a way to do sth”表示“做某事的方法”，不定式作后置定语修饰way，故填to build。
【答案】1. it 2. to do 3. helpful 4. to build
【知识点】it作形式主语、形容词转换、不定式的用法
【点评】本题聚焦初中英语核心基础语法，涵盖it作形式主语的常见结构、词形转换等考点，难度较低，熟练掌握相关固定搭配即可正确作答，是巩固语法知识的典型练习题。
【难度系数】0.7
