1. Change the following sentences from Active into Passive: 1. You must take this medicine regularly. 2. Students must do homework in time. 3. We can win peace. War is not inevitable. 4. You may put the book on the upper shelf. 5. You may allow the children to go for a walk. 6. We must discuss the matter not later than tomorrow. 7. Nobody can do it without your help. 8. We must look into the matter. 9. You mustn't take the magazine away. 10. You must post the letter as soon as you have written it. 11. May I take the books and papers away? 12. I must pay for the dinner. 13. You must work for success, 14. You can't describe it. One must just see it. 2. Fill in the blanks with didn't have to or needn't have: 1. You ... (to bring) your umbrella, as we are going by car. 2. You ... (to water) the flowers, as it is going to rain. 3. I ... (to translate) it for him, he did it himself, he understands Latin. 4. I... (to answer) the questions, which saved me a lot of trouble. 5. I knew I ... (to lock) the door after me, but how was I to know you wanted to come out, too? 6.1... (to ring) the bell because the door opened before I got to it. 7. I... (to help) them at all, they themselves knew what to do. 8. I ... (to write) him because the news was already known to him. He phoned me shortly afterwards. 9. You ... (to listen) to him. His information was misleading. 10. You ... (to buy) such a lot of flowers. We've already got more than necessary. 11. He... (to get up) so early every day. It was only on that particular occasion that he did. 12. You ... (to say) if you didn't want to. We could have done without you just as well.