一般动词不能直接拿到主语前构成
一般疑问句，要借助于
助动词do、does。do用于主语为第一、二人称单复数和第三人称复数，does用于第三人称单数，后面跟的是一般动词的原形形式，如：
Do you visit your grandmother on Sundays?
Does he come from New England?
这第二句话不能说成：
Does he comes from New England?
此外，助动词do和does还有下列一些用法：
构成现在一般时和过去一般时的否定句。如：
She didn’t cool down for hours after that argument. 在那场争辩之后，她好几个小时都没平静下来。
Don’t worry, he will be brought to book for his wickedness
one day. 别担心，他的恶行总有一天受到惩罚的。
用于替代，以避免重复。如：
—May I come round in the morning? 上午我可以来拜访你吗?
—Yes, please do. 可以，请来吧。(do替代come round)
I don’t like coffee and neither does my wife. 我不喜欢咖啡，我妻子也不喜欢。(does替代like)
用于强调。如：
My parents didn't think I studied for my exams, but I did study. 我爸爸妈妈认为我考试前没有复习，但我是复习了。
Although I have little time for entertainment, I do go to the theatre once in a while. 虽然我很少时间娱乐，但我还是间或去看戏。
We’re very pleased that she does intend to come. 她的确打算来，我们非常高兴。
The letter we were expecting never did arrive. 我们期待的信一直没有到。
—Do you remember how kind she was? 你记得她多友善吗?
—I certainly do remember. 当然记得。
用于恳求。如：
Do come to the party tonight. 务请今晚来参加晚会。
Do be quiet! 请别作声!