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?

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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?

助动词，帮助句子构成疑问句哦

这个地方的do,跟这个句子是类似的，Do his parents let him watch tv? 构成疑问句
对于How often 可以直接无视。
是必须要的。

是助动词哦！

How long ago did you start school? how,spend,did,there,long,you(?) How long did you stay there? how long did you ____ it how long did you stay in Beijing? how long did you stay there?能否改为 how long did you stay at there? How long did you Spend (do) your homeHow long did you Spend (do) your homework how long haveyoubeen和how long did you skate?有什么区别?how long haveyoubeen和 how long did you skate?有什么区别? How long have you been skating?与How long did you skate?的区别 how long ago did you start school?怎么回答? How long did you stay there? 应该怎么回答 英语改错“How long did you find it? How long did you spend ---(do)sport yesterday? how long完成时how long不是问一段时间的吗?为什么可以用How long did you stay? how long haveyoubeen和how long did you skate?什么区别? How long did you sleep为什么用did ,不能用were you sleeping 或 asleep. -how/when /where/how long did you guess?-the way you speak.哪一个,是什么意思 How long have you been skating?How long did you skate?中文翻译的区别以及语法的区别是什么?