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how long did you stay here how often do his parents let him

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/07/04 17:15:21
how long did you stay here how often do his parents let him watch TV?where do they come from
这些句子中的do 是什么用法?
what when how who where ...开头的特殊疑问句,在提问的时候,
一般来说,一般现在时,一般过去时句子的行为动词要使用助动词do(does,did)
例:What subjects does he study in the university?
When did you go to school yesterday?
但是,在正在进行时,一般将来时,就不用 do(does,did),因为要用助动词:be/shall/will
例:What are you reading now?
When will you go to see a film?
或者,是动词BE句子不用do(does,did)
例:Who is your English teacher?