Bài tập 2: Viết lại câu sao cho nghĩa không đổi 1. Turn off all the lights and you will not pay more money. 2. Unless she wears warm clothes, she will have a cold. 3. Be careful or you may have an accident. 4. phone your parents or you have a trouble. 5. Unless she whispers, everyone knows what she is saying. 6. Stay here and you will feel save. 7. Pay electricity bill today or your electricity will be cut off. 8. Stop smoking otherwise your cough may be worse. 9. Unless we use less fossil fuel, they will be run out soon. 10. Unless it stops raining today, we may be faced with a serious flood. 11.Do morning exercises regularly, your body will be fitter. 12. Unless we renewable energy, we will have nothing for the future generation. 13. The climate will change unless we reduce the use of non-renewable energy. 14. Lock all the doors and noone can break into your house. 15. Unless we continue hunting polar bears, they will become extinct in near future. 16. If Andrew is not lazy, he will pass the final examination. (unless) 17. John will not catch the train unless he runs more quickly. (If) 18. The tree will die if it isnt watered every day. (unless) 19. Life wont be very easy if we dont earn lots of money. (unless) 20. If you dont practice more often, your English wont be better. (unless) 21. Jack will be dismissed if he doesnt try to work harder. (unless) 22. Work harder or you will lose your job. 23. Pay attention to the teacher or you wont understand the lessons. 24. Go to bed early or you cant get up early the next morning. 25. Save money now or you will be in debt in the future. 26. Read more referent books if you want to win a place at university. 27. Driving more carefully or you will have an accident. 28. Brush your teeth often in order not to get toothache. 29. Listen carefully or you wont know what to do.