英语中助动词do,does和be动词am,is,are,在问句中的用法.请详细解释（不知道提问时什么时候用is提问,什么时候用do）谢谢!

你好，我编了以下顺口溜，希望帮上你！(1)be动词：我用am你用are，is用于他她它；单数is复数are，记住规则不用怕。(2)助动词：有动词，借助动，三单来把ends用，其它用do路路通。

be 动词(am is are) 和助动词(do does)常有人搞不懂啊~~
用法当然很多, 这里也讲不完, 简单来说,
be动词後面常接名词, 形容词, 代词, 动名词(动词-ing), 或句子.
如: I am a student. (am 接student-->名词)
She is pretty. (is接pretty-->形容词)
It was him whom she saw in the classroom. [was(am, is的过去式)接him-->代词]
They are swimming. (are接swimming-->动词-ing)
do, does 常用来帮助一般动词完成否定句或问句,
如: He doesn't like flowers. (does not= doesn't 接一般动词 like)
Do you have 100 dollars? (do後接一般动词 have)
注意: I, you, we , they, 或两人以上的复数名词或代词, 搭配do构成句子.
he, she, his brother...等第三人称单数, 搭配does.

这个还真不是三言两语说的清楚的助动词是帮助动词的,也就是说,有实义动词,这个句子又要变成问句或者否定句,就需要助动词出来帮忙了,例如You walk to school 你步行上学Do you walk to school?你步行上学吗?—— 变成...

一两句话解释不清楚的，买本语法好好读读