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be动词和do/does的区别

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be动词和do/does的区别
be动词和do/does的区别
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.
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?
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.变否定句时把don’t/doesn’t放在动词的前面.要注意观察动词的形式并对号入座.一般疑问句和否定句的动词三单式都要变回原型.
play-----do plays-----does
例如:
肯定句:They play football after school.He plays football after school.
一般疑问句:Do they play football after school?Does he play football after school?
否定句:They don't (do not) play football after school.He doesn’t’ play football after school.
画线提问:对they/he提问:Who plays football after school?
对play football提问:What do they do after school?What does he do after school?
对after school提问:When do they play football?When does he play football?
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