先告诉你，你快乐吗？正确用法是：

Are you happy?

再来试一个，他是学生吗？

Is he a student?

or

Does he a student?

哪个正确呢？

马上来学

Do/ Did

(Wh)+do / did +subject+base verb

What do you do?

你的工作是什么？

Do you want to go？

现在走吗

Be

Be+subject+

age/verb-ing/adj./noun+preposotion/adverb

Where are you from？

你从哪里来？

Are you happy?

你开心吗？

Where are you going?

你要去哪儿

Is he here?

他在这儿吗？

Is he a student?

他是学生吗？

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