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4. -> All the computers have been stolen. 5. -> This poem must be learnt by heart. 1. them changed 2. your motorbike fixed 3. his flat broken into 4. her hair cut 5. had my car washed 1. Astronauts spending weeks in space get homesick. (Using the present participle clause) 2. My uncle bought a pen made of gold. (Using the past participle clause) 3. Three men coming out of the restaurant late at night saw the robbery. (Using the present participle clause) 4. She was the only person to finish the course. (Using the infinitive clause) 5. Tom is the last person to enter the room. (Using the infinitive clause) Here are the rewritten sentences using the third conditional: 1. He didn't study his lessons very carefully, so he got bad marks. -> If he had studied his lessons more carefully, he wouldn't have got bad marks. 2. We did not visit the museum because we had no time. -> If we had had time, we would have visited the museum. 3. She got bad marks because she didn't study hard. -> If she had studied harder, she wouldn't have got bad marks. 4. I didn't know that you were in hospital, so I didn't visit you. -> If I had known that you were in hospital, I would have visited you. 5. It rained heavily, so the football match was cancelled. -> If it hadn't rained heavily, the football match wouldn't have been cancelled. Here are the answers: 1. A. composer 2. B. choreographer 3. D. director 4. C. sculptor 5. D. playwright 6. B. commuters 7. street vendors