学习必备欢迎下载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 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. 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。学习必备欢迎下载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? 针对性练习按要求改写句子：1. I know the answer.(一般疑问句 ) ______ ______ __________the answer? 2. We can see some birds.(一般疑问句 ) ______ ______ see ______ birds? 3. He designs clothes.(一般疑问句 ) 学习必备欢迎下载 ______ he ________ clothes? 4. There are some flowers on the teachers’ desk.(一般疑问句) ______ _...
