Must
Students must attend school on time
Students must complete homework
Students must actively express their opinions
Students have to be honest when doing tests
Students must be polite to the teacher
Students must wear uniforms prescribed
Students must unite
Students must study hard
Students must pay attention to lecture
Students must write full papers
Mustn't
- You mustn't using phone in class
- You mustn't talk in class
- You mustn't joking in class
- You mustn't play football in school yard.
- We mustn't pick flowers in the school garden - You mustn't throw trash or draw on the walls.
- You mustn't copying your friend's homework.
- You mustn't fight with your friends - You musn´t talk in the lesson.
- You musn´t use the phone in the class.
- You musn´t make-up in the class.

*So sánh cao nhất của tính từ ngắn: the adj + -est + (N)
- Bikes are the slowest of the three vehicles. (Xe đạp là chậm nhất trong số ba phương tiện.)
- My village is the quietest place in the province. (Làng tôi là nơi yên tĩnh nhất của tỉnh.)
*So sánh cao nhất của tính từ dài: the most + adj + (N)
- The lion is the most dangerous animal of the three. (Sư tử là loài nguy hiểm nhất trong ba loài này.)
- The brown dress is the most expensive. (Chiếc váy màu nâu là đắt nhất.)
*So sánh cao nhất của tính từ bất quy tắc
She moved further down the road. (Cô ấy đi ra xa hơn về phía cuối con đường.)
She moved farther down the road. (Cô ấy đi ra xa hơn về phía cuối con đường.)

Đặt 5 câu có must, mustn't
1:Must:
>>She must do all homework before you go to school
>>You must play that because there isn't any game to play
>>He gets up too late, so he must hurry up
>>We must call it by that name
>>I must go to school on Monday.
2:Mustn't:
>>Look at that sign! We mustn't smoke here.
>>My mother is sleeping, so you mustn't make noise
>>I was detained so I mustn't go out
>>They mustn't play any game on the road, it's too dangerous
>>You mustn't draw on the wall.
Đặt 5 câu so sánh nhất tính từ dài, tính từ ngắn, tính từ bất quy tắc:
1:So sánh nhất tính từ dài:
>>I am the most intelligent student in my class
>>My dad are the most carefull in my family.
>>That TV is the most expensive here
>>He is the most bored tiring in my class now
>>I think it's the most stupid here
2:So sánh nhất tính từ ngắn:
>>My town is the narrowest in my common
>>He is the fattest in my class
>>She is the happiest here
>>He is the cleverest in that class
>>Lily is the gentlest in my class
3:So sánh nhất tt bất quy tắc:
>>He is the best student
>>She is the worst driver
>>That way is the furthest now
>>My grandfather is the oldest
>>That snack is the least snack in this store.