一般现在时的疑问句（questions）

I, you, we, they 用助动词 do，第三人称单数he, she, it 用助动词does。

语序 

[疑问词] + 助动词 + 人称 + 动词（原形）

Where do you live? 你住在哪儿？

Where does he/she live?

Where do they live?

What do you do? 你是做什么（工作）的？

What does he/she do?

What do they do?

Why do you argue all the time? 为什么你（们）总是吵架？（argue 动词，争论，争吵，争辩，辩论，论证；all the time 总是，一直）

Why does he/she argue all the time? 

Why do they argue all the time? 

Do you live here?

Does he/she live here?

Do they live here?

简短回答（short answers）

- Do you live here?

- Yes, I do. / No, I don’t.

- Does he/she speak English? 他/她说英语吗？

- Yes, he/she does. / No, he/she doesn't.

- Do we take this train? 我们坐这趟火车/列车吗？

- Yes, we do. / No, we don't.

- Do I sign here? 我签在这里吗？（sign 动词，签名，签字）

- Yes, you do./ No, you don't.