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.
you for helping me.(同义句)
Thank you for ______ ______ .
aren’t any pears in thebox.(同义句)
There are ______ pears in the box.
are these clothes(同义句)
______ ______ are these
me look at your book.(同义句)
Let me ______ ______ ______ ______ your book.
sweater is red.(对划线部分提问)
______ ______ is her sweater
pencils are in the pencil-box.(对划线部分提问)
______ ______ your pencils
get up at six every day.(对划线部分提问)
______ ______ do you get up every day
are fifty students in my class.(对划线部分提问)
______ ______ students are there in your class
are cars.(用buses改写成选择疑问句)
Are these cars______ ______
book is in my schoolbag.(变否定疑问句)
______ the book in your school-bag
boys are in our house.(改为there be句型)
______ ______ two boys in our house.
’t you find the map(作肯定回答)
______ ,I______ .
参：
you you,any there,your there any not any ’t,is don’t not help clothes a look at colour are time many buses ’t are ,can
一、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，already改为yet，and改为or等：
There are some birds in the tree. 树上有些鸟。
→There aren’t any birds in the tree. 树上没有鸟。
He likes the girl, too. 他也喜欢这个女孩。
→He doesn’t like the girl, either. 他也不喜欢这个女孩。
We have already seen the film. 我们已看过这部电影。
→We have not seen the film yet. 我们没有看这部电影。
He likes singing and dancing. 他喜欢唱歌和跳舞。
→He doesn’t like singing or dancing. 他不喜欢唱歌也不喜欢跳舞。
二、不变谓语动词而变其他词语
有时将肯定句变为否定句时，不改变谓语而改变其他词语：
Both of us went there. 我们两人都去了那儿。
→Neither of us went there. 我们两人都没去那儿。
Both Jim and Mary can sing this song. 吉姆和玛丽都会唱这首歌。
→Neither Jim nor Mary can sing this song. 吉姆和玛丽都不会唱这首歌。
All of the books are worth reading. 所有这些书都值得读。
→None of the books are worth reading. 所有这些书都不值得读。
三、部分否定与完全否定
比较以下句子：
All of us laughed when we heard it. 听到这事时我们都笑了。(肯定句)
All of us didn’t laughed when we heard it. 听到这事时我们并未都笑。(部分否定)
Not all of us laughed when we heard it. 听到这事时我们并未都笑。(部分否定)
None of us laughed when we heard it. 听到这事时我们都没笑。(完全否定)
【注】可能涉及部分否定的词语有both, all, always, every等，即not both表示“并非两者都”，not all 表示“并非所有的都”，not always 表示“并非总是”，not every表示“并非每个…都”。
