Còn ai k giúp e mới ah 🥺🥺🥺🥺🥺🥺

2. You are not allowed to cross this area. (must)

You must not cross this area.
3. It's advisable for him to tell the truth to his parents about his problems. ( should)

He should tell the truth to his parents about his problems. 
4. It is not necessary for you to take this course. ( have to )

You don't have to take this course.
5. You are not allowed to cross this area. (must)

You must not cross this area. 
Exercise 2: 
1. My parents never let me forget to do my homework.
=> My parents always make me do my homework.
2. They always refuse to allow me to stay overnight at my friend's.
=> They never let me stay overnight at my friend's.
3. They insist that I should come home at 9 o' clock every night.
=> They make me come home at 9 o' clock every night.
4. I can go out with my friends at weekend.
=> I am allowed to go out with my friends at weekend.
5. It is not necessary for me to agree with everything my parents say.
=> I don't have to agree with everything my parents say.
Exercise 3:  
1. The headmaster gave Tam a bicycle as a scholarship.
->It was the headmaster who gave Tam a bicycle as a scholarship.
2. My secretary sent the bill to Mr. Harding yesterday.
>It was the bill  that my secretary sent the bill to Mr. Harding yesterday.
3. The president makes the important decisions.
->It is the important decisions that the president who makes .
4. My secretary sent the bill to Mr. Harding yesterday.
>It was yesterday that my secretary sent the bill to Mr. Harding .
5. Her absence at the party made me sad
- It was Her absence at the party that made me sad