Fill in must, mustn't or needn't: 1. You ... play with matches. It's dangerous. 2. You ... talk loudly. The baby is sleeping. 3. I ... go to the bank. I've got some money. 4. We ... stay out late. We have to get up early tomorrow. 5. You ... feed the dog. I'll do it. 6. I ... forget to buy some milk. There isn't any left. 7. You ... talk during the exam. 8. You ... phone Julia. She's coming here later. 9. You ... take your umbrella, It's stopped raining. 10. You ... park here. There's a "No Parking" sign. 11. You ... come with me. I can go alone. 12. You ... lose the key. I haven't got another. 13. You ... tell Sonia. It's a secret. 14. You ... buy a paper. You can read mine. 15. You ... go by taxi. I can give you a lift.

Solution:

• 1. You mustn't play with matches. It's dangerous. (It is forbidden.)
• 2. You mustn't talk loudly. The baby is sleeping. (It is forbidden or not allowed.)
• 3. I needn't go to the bank. I've got some money. (It is not necessary.)
• 4. We mustn't stay out late. We have to get up early tomorrow. (It is forbidden or not advisable.)
• 5. You needn't feed the dog. I'll do it. (It is not necessary for you to do it.)
• 6. I must forget to buy some milk. There isn't any left. (It is necessary to remember to buy milk because there is none left.)
• 7. You mustn't talk during the exam. (It is forbidden.)
• 8. You must phone Julia. She's coming here later. (It is necessary to call Julia.)
• 9. You needn't take your umbrella, It's stopped raining. (It is not necessary anymore.)
• 10. You mustn't park here. There's a "No Parking" sign. (It is forbidden.)
• 11. You needn't come with me. I can go alone. (It is not necessary for you to accompany me.)
• 12. You mustn't lose the key. I haven't got another. (It is forbidden or very important not to lose it.)
• 13. You mustn't tell Sonia. It's a secret. (It is forbidden.)
• 14. You needn't buy a paper. You can read mine. (It is not necessary for you to buy one.)
• 15. You needn't go by taxi. I can give you a lift. (It is not necessary to take a taxi.)

Answer: 1. mustn't 2. mustn't 3. needn't 4. mustn't 5. needn't 6. must 7. mustn't 8. must 9. needn't 10. mustn't 11. needn't 12. mustn't 13. mustn't 14. needn't 15. needn't