be动词,情态动词及助动词用法
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七年级英语双休日作业
班级：姓名：等级英语句型变化总结练习
1、含有be 动词am，is，are 构成的句子：变一般疑问句时把am，is，are提到句子的前面，句尾用问号即可。变否定句时直接在am，is，are 后面加not 即可。例如：
肯定句:He is a student. 一般疑问句: a student?
否定句: He a student. 肯定句：We are from China. 一般疑问句: from China?
否定句：We from China 2. 由情态动词can, may, should 等构成的句子: 变一般疑问句时把can, may,提到句子的前面,句尾用问号即可. 变否定句时直接在can, may,后面加not 即可. 例如: 肯定句: She can swim. 一般疑问句: she swim?
否定句: She swim.
3. 由行为动词构成的句子: 需要加助词do或does. 变一般疑问句时把do/does 放在句子前面. 变否定句时在主语后面加don't / doesn't , 谓语用动词原形。例如: 肯定句: They play football after school.
一般疑问句: play football after school?
否定句: They football after school.
肯定句：Tom watches TV every day.
一般疑问句: Tom TV every day?
否定句: Tom TV every day.
注意：变否定句时相关词的改变肯定句变否定句时，除将谓语变为否定式外，句中其他词语也可能随之改变：
如将some 改为any，too 和also 改为either，and 改为or 等：
There are some birds in the tree. 树上有些鸟。
→ There aren't ____ birds in the tree. 树上没有鸟。
He likes the book, too. 他也喜欢这本书。
→ He doesn't like the book, ___ .他也不喜欢这本书。
He likes singing and dancing. 他喜欢唱歌和跳舞。
→ He doesn't like singing ___ dancing. 他不喜欢唱歌也
不喜欢跳舞。补充练习：
根据句后括号内的要求，填入句中所缺的词：
1.I know the answer. （一般疑问句）
_____ ______ know the answer?
2.We can see some birds. （一般疑问句）
_____ ______ see _____ birds?
3.There is a computer in the house. （一般疑问句）
_____ ______ a computer in the house?
4.There are some flowers on the teachers' desk. （一般疑问句）
_____ ______ any flowers on the teachers' desk?
5.There are some apples on the tree. （否定式）
There _____ _____ ______ apples on the tree.
6.I think he is old. （否定句）I ______ think he ______ old.
7.Open the window. （否定句）_____ open the window.
8.We can speak good English. （变否定句）
We ______ ______ speak good English.
9.Thank you for helping me. （同义句）
Thank you for ______ ______ .
10.Whose is this book? （同义句）______ ______ is this?
11.This is her book. （同义句）This book _______ ______ .
12.Her sweater is red. （对划线部分提问）
_____ _____ is her sweater?
13.My pencils are in the pencil-box. （对划线部分提问）
_____ _____ your pencils?
14.I get up at six every day. （对划线部分提问）
______ _____ do you get up every day?
15.There are fifty students in my class. （对划线部分提问）
_____ _____ students are there in your class?
16.These are cars. （用buses 改写成选择疑问句）
Are these cars ______ ______ ?
17.The book is in my schoolbag. （变疑问句）
_____ the book in your school-bag?
18.Two boys are in our house. （改为there be 句型）
_____ _____ two boys in our house.
19.Can you find the key? （作肯定回答）______ ,I _____ .
20.It's Monday today. （对划线部分提问）______ _____ is it today ?