You'd better go to the doctor about your cough.

你最好去找医生看看你的咳嗽。

Why won't you go to the doctor?

你为什么不去看医生？

I don't want to go to the doctor.

我不想去看医生。

A Maybe you should go to the doctor.

A也许你应该去看医生。

You need to go to the doctor for a checkup.

你需要到医生那里去检查一下。