how long did you stay here how often do his parents let him watch TV?where do they come from
题目
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?
答案
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?
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已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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