1. How long have you known him? 2. They had a three-day trip. 3. In case it rains hard this afternoon, take the rain coat with you. 4. She forgot to do the washing up. 5. It is easy to learn English. 6. If you leave the lights on all night, you will waste electricity. 7. It was too old to keep the furniture. 8. No one else in her class is as good a guitarist as Gary. 9. Since the computer was invented, people have saved a lot of time. 10. Everybody needs to clean up their neighborhood once a week. Exercise 4: 1. You need to finish the work today. 2. Sally finally succeeded in getting the job. 3. I certainly won't go to this restaurant again. 4. You'd better take a holiday, the doctor continued. 5. Unless you rest yourself, you really will be ill. 6. You were told by the doctor that you work too hard. 7. How beautiful those pictures are! 8. What an interesting film it was. 9. How much does your suitcase weigh? 10. What is the height of Peter's father?