问问题描述
答精选答案
be动词，情态动词，助动词do/does的用法区别及练习
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 heor 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.
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. 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 schoolDoes 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 schoolWhat does he do after school
对after school提问: When do they play footballWhen does he play football
答其他回答（2条）
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本文概览：be动词，情态动词，助动词do/does的用法区别及练习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 heor What does he do 2