`1` I have to go to school

`=>` Tôi phải tới trường 

`2` We have to clean the house 

`=>` Chúng tôi phải dọn nhà.

`3` He has to do the homework 

`=>` Anh ấy phải làm bài tập

`4` She has to cook the dinner.

`=>` Cô ấy phải nấu ăn

`-` I / you / we / they + have / haven't

`-` he / she / it + has / hasn't 

`5` I must go to the supermarker.

`=>` Tôi phải đi siêu thị

`6` You must clean the floor.

`=>` Bạn phải lau nhà

`7` You mustn't cross that bridge.

`=>` Bạn ko được đi qua cây cầu đó

`8` I mustn't copy anyone in the exam.

`=>` Tôi ko được sao chép ai trong kt. 

Have to:

- My father says that I have to be home by 9p.m

-  I have to go to school today.

Has to: 

-She has to wear that costume becausex it is the family tradition

- She has to take medicine before going to bed

Must:

You must deliver this to me today

I must go to the meeting place by 7:00 pm

Mustn't:

You mustn't using phone in class

- We mustn't pick flowers in the school garden - You mustn't throw trash or draw on the walls.