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do和is的区别是什么【开头提问】

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do和is的区别是什么【开头提问】
做练习问问题总是不知道用do还是is,如果有回答我就会,可没有回答该怎么办
例:Does Alice go to school by bus?
Is Alice goes to school by bus?
用哪一个?还是都可以?
= =例子随便打的,不对就说
例:Does Alice go to school by bus?
Is Alice goes to school by bus?
用哪一个?还是都可以?
第二句是错误的.
Do you go to school by bus?
用动词时就是do/does
Is Alice going to school by bus?
这个be+doing是进行时;
Is he a student?(陈述句:He is a student.)
主语后是名词
Is she beautiful?(陈述句:She is beautiful.)
主语后是形容词.