这个分为be动和助动.（一般现在时）
be动：I am, we are, you are, they are.例如,We are classmates.
be动变成一般疑问句时就是把be动词提前,我们换成你们,其它照抄,例如,Are you classmates?
助动就是需要助动词do来帮助完成否定句和疑问句的.当主语是I/we/you/they时,动词用原形.例如,I think milk is good. We come from China. You do homework. They clean the room every day.
变成一般疑问句就是：Do + 主语 +动词原形+其它成分?
例如：Do you think milk is good? Do you come from China? Do you do homework?
Do they clean the room every day?
希望能帮到你啊~