Bài tập 1: Điền dạng đúng của động từ 1. If she ....................(work) hard, she .....................(pass) the exam. 2. If I ..................(come) soon, I ....................(phone) you. 3. She ...................(feel) sad if you ....................(not, give) her a gift. 4. If Peter ......................(go) to work late again, he .................(be) sacked. 5. No one .........................(know) the truth if you ................(not, reveal) 6. If the boy ....................(eat) that apple, he ....................(be) ill. 7. If you .....................(not, hurry), you .....................(miss) the bus. 8. Tell him about this story if you .........................(see) him. 9. If you ..........................(have) a day off where you..............(go)?\ 10. If he ..................(cook) the meal himself, help him. 11. If few people .....................(come) to the meeting, please postpone to the other day. 12. If it .......................(not, be) warm this afternoon, we ...................(put off) the game. 13. Your father ...............(pick) you up if you ..................(come) back late? 14. What you ..................(speak) if you ....................(meet) a foreigner? 15. Unless he .................(answer) all my questions, I ...................(not, help) him. Ex2: Rewrite these sentences by using conditional sentence Type I 1. Turn off all the lights and you will not pay more money. If .......................................................................................................... 2. Unless she wears warm clothes, she will have a cold. If .......................................................................................................... 3. Be careful or you may have an accident. If .......................................................................................................... 4. phone your parents or you have a trouble. If .......................................................................................................... 5. Unless she whispers, everyone knows what she is saying. If .......................................................................................................... 6. Stay here and you will feel save. If .......................................................................................................... 7. Pay electricity bill today or your electricity will be cut off. If .......................................................................................................... 8. Stop smoking otherwise your cough may be worse. If .......................................................................................................... 9. Unless we use less fossil fuel, they will be run out soon. If .......................................................................................................... 10. Unless it stops raining today, we may be faced with a serious flood. If .......................................................................................................... 11.Do morning exercises regularly, your body will be fitter. If .......................................................................................................... 12. Unless we renewable energy, we will have nothing for the future generation. If .......................................................................................................... 13. The climate will change unless we reduce the use of non-renewable energy. If .......................................................................................................... 14. Lock all the doors and noone can break into your house. If .......................................................................................................... 15. Unless we continue hunting polar bears, they will become extinct in near future. If .......................................................................................................... 3.Combine each pair of sentences to make a conditional sentence type 1. 1.Students are more aware of protecting the environment. Teachers teach environmental issues at school. If ………………………………………………………………………………………………… 2.Light pollution happens. Animals change their behaviour patterns. If ……………………………………………………………………………………………….. 3.The levels of radioactive polluion decrease.We switch from nuclear power to renewable energy sources. If ………………………………………………………………………………………………….. 4.The water temperature increases.Some aquatic creatures are unable to reproduces. If……………………………………………………………………………………..................... 5.People get more diseases.The water is contaminated. If …………………………………………………………………………………………………