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1·I have to go to the dentist tomorrow.

我明天得去看牙医。《牛津词典》

2·There is something wrong with his teeth, so he should go to the dentist.

他的牙齿有点问题，所以他应该去看牙医。

3·If you have a toothache, you have to go to the dentist.

如果你牙痛，你应该去看牙医。

4·How often do you go to the dentist?

你多久去看一次牙医？

5·How often should we go to the dentist?

我们应该多久去看一次牙医？

6·You should go to the dentist.

你该去看看牙医。

7·I go to the dentist once a year.

我一年看一次牙医。

8·How often does she go to the dentist?

你认为她是个牙医吗？

9·I must go to the dentist this morning.

今天上午我必须去看牙。

10·I need to go to the dentist this morning.

今天上午我需要去看牙。