Fill in the blanks with needn’t and mustn’t.
1. You can leave when you have finished your job. You ................................ wait for me.
Correct!
Wrong!
Needn't shows lack of obligation or necessity.
2. You ........................... do it again. If you do, you will be in trouble.
Correct!
Wrong!
Must not is used to prohibit.
3. You don't have much time. You .......................... hurry.
Correct!
Wrong!
4. You ........................... not enter my room without my permission.
Correct!
Wrong!
5. You ........................... my permission to use my computer.
Correct!
Wrong!
6. Nobody was hungry. You ................................ have cooked so much food.
Correct!
Wrong!
7. You ......................... not wait until the last moment.
Correct!
Wrong!
8. She will arrive soon. You ........................... worry.
Correct!
Wrong!
9. I can do it alone. You .............................. help me.
Correct!
Wrong!
10. Everything was alright. I ................................. so much.
Correct!
Wrong!
11. I am not working tomorrow, so I ................................. get up early.
Correct!
Wrong!
12. You ............................ tease animals.
Correct!
Wrong!
Answers
1. You needn’t wait for me.
2. You must not do it again.
3. You don’t have much time. You must hurry.
4. You must not enter my room without my permission.
5. You need my permission to use my computer.
6. Nobody was hungry. You needn’t have cooked so much food.
7. You must not wait until the last moment.
8. She will arrive soon. You needn’t worry.
9. I can do it alone. You needn’t help me.
10. Everything was alright. I needn’t have worried so much.
11. I am not working tomorrow, so I needn’t get up early.
12. You must not tease animals.
