be动词,情态动词及助动词用法.doc

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 China2. 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dont / doesnt , 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 arent _ birds in the tree. 树上没有鸟。He likes the book, too. 他也喜欢这本书。He doesnt 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 doesnt 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