1. where’s an| the electric heater? i can’t film it. 2. what happened at an|the end of a|the film? 3. david has at|the appointment at a|the optician’s. 4. an/the old person sometimes feels lonely. 5. peter owns a/the largest model plane in a/the world. 6. luckily a/the fire brigade soon came and put out a/the fire. 7. harry's mother bought him a/the guitar for his birthday present, 8. i'm thinking of buying a/the new pair of trousers. 9. in the end there was a/the war between the two countries, 10. i didn't know an/the answer to a/the question, so i left it out.
2. Whatever you do, you mustn't touch that switch. It`s very dangerous.
3. You mustn't forget what I told you. It`s very important.
4. We don't have to leave yet. We`ve got plenty of time.
5. Ann was feeling ill last night. She had to leave the party early.
6. I had to go to the bank yesterday to get some money.
7. The windows are very dirty. I must clean them.
8. The windows aren`t dirty. You don't have to clean them.
9. We arrived home very late last night. We had to wait half an hour for a taxi.
10. These cakes are very nice. You must have one.
11. We don't have to take an umbrella. It`s not going to rain.
Perfect 4. has been analysed 7. had analysed 2. had heated 3. shall have been heated 5. will have heated 1. have been transformed 4. will have transformed 5. has transformed 2. have tested 5. had been tested
Perfect Continuous 7. has been heating 6. will have been transforming 7. has been testing
Simple 1. was analysed 2. will analyse 5. analysed 1. shall heat 6. heat 3. transforms 3. tests 6. is tested 8. shall be tested