1. You must find the tickets soon. 2. Turn the radio down, please. 3. Tidy your room. 4. Could you post the letters, please? 5. Why don't you see a doctor? 6. You have a bad cough. I think you should stop smoking. 7. Why don't you clean your shoes? 8. Brush your teeth, will you? 9. We have guests today. Shall we make a cake? 10. We should invite Mary to the party. D) Follow the example and do the same using YET: Example: She has been in the shop. (buy anything) - She has been in the shop but she hasn't bought anything YET. 1. I've written to them three times. (not reply) 2. I've asked you again and again. (not do it) 3. I lent him $$10 last month. (not give it back) 4. He lost his pen a week ago. (not find it) 5. He borrowed my book last year. (not give it back) 6. She went to New York six months ago. (not return it) 7. She gave me $$2 a week ago. (not return it) 8. I finished reading my library books a long time ago. (not change them) 9. She went to the bus-stop half an hour ago. (the bus / not come) 10. He's still studying that lesson. (not learn it)