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

1

1. You ought to ask him for help with this exercise
2. You mustn’t cross this area
3. You don’t have to take this course

2

1. My parents always remind me to to my homework
2. Thay never let me stay overnight at my friend’s
3. They make me to come home at 9 o’clock every night
4. I am allowed to go out with my friend at the weekend
5. I don’t have to agree with every things my parents say

3

1. It was the headmaster that gave Tam a bicycle as a scholarship
2. It is the important decisions that The president makes
3. It was the bill that my secretary sent to Mr Harding yesterday
4. It was yesterday that my secretary sent the bill to Mr Harding