英语中be动词用法和助动词

英语中b e动词用法和助动词---

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英语中be动词用法和助动词---do

1. 由连系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: Is he a student 否定句: He is not a student. 反问句: He is a student, isn't he He isn't a student, is he 画线提问: 对he提问: Who is a student 对 a student 提问: What is he or What does he do 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: Can she swim 否定句: She can not swim. 反问句: She can swim, can't she She can not swim, can she 画线提问: 对she提问: Who can swim 对swim提问: What can she do 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. 例如: 肯定句: They play football after school. 一般疑问句: Do they play football after school 否定句: They don't (do not) play football after school. 反问句: They play football after school, don't they They don't play football after school, do they 画线提问: 对they提问: Who play football after school 对play football提问: What do they do after school 对after school提问: When do they play football

1. 由连系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: Is he a student 否定句: He is not a student. 反问句: He is a student, isn't he He isn't a student, is he 画线提问: 对he提问: Who is a student 对 a student 提问: What is he or What does he do 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: Can she swim 否定句: She can not swim. 反问句: She can swim, can't she She can not swim, can she 画线提问: 对she提问: Who can swim 对swim提问: What can she do 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. 例如: 肯定句: They play football after school. 一般疑问句: Do they play football after school 否定句: They don't (do not) play football after school. 反问句: They play football after school, don't they They don't play football after school, do they 画线提问: 对they提问: Who play football after school 对play football提问: What do they do after school 对after school提问: When do they play football

根据句后括号内的要求，填入句中所缺的词：

know the answer.(一般疑问句)

______ ______ know the answer

can see some birds.(一般疑问句)

______ ______ see ______ birds

is a computer in my house.(一般疑问句)

______ ______ a computer in house

are some flowers on the teachers’desk.(一般疑问句) ______ ______ ______ flowers on the teachers’desk are some apples on the tree.(否定式)

There ______ ______ ______ apples on the tree.

think he is very old.(否定句)

I ______ think he ______ very old.

colour it green.(否定句)

______ ______ colour it green.

can speak good English.(变否定句)

We ______ ______ speak good English.