II. Write the correct form of each verb in brackets.
1. If you put the glasses into very hot water, they……………………(crack).
2. If Peter………………(be) late, we will wait for him.
3. No one…………………..(help) if you don’t help yourself.
4. If you boil water, it…………………(disappear) into the atmosphere as vapor.
5. If it rains tonight, I…………………..(not go) for walk.
6. The town will flood if there …………………(be) a downpour.
7. The bear will attack you if you…………………..(provoke) it.
8. If we sit too far from the screen, I……………..(not be) able to see the film.
9. If there is an earthquake, the villagers ……………….(stay) in the shelter.
10. If we plant more trees, the air………………….(be) fresher.
III. Rewrite the sentences, so that their meaning stays the same, using the beginning given for each.
1. We must leave now, or we will miss the plane.
If we don’t ……………………………………………………………………
2. Be careful or you may fall.
If you………………………………………………………………………….
3. Hurry up or we’ll be late for the concert.
If………………………………………………………………………………
4. Our sources of energy will soon end if we don’t try to save them.
Unless…………………………………………………………………………
5. You will catch a cold if you don’t keep your feet dry.
Unless…………………………………………………………………………
6. If she doesn’t work harder, she’ll lose her job.
Unless…………………………………………………………………………
`II`.
1. will crack (Câu đk loại 1: If + S + V(s,es), S + will + V(inf)
2. is (câu đk loại 1)
3. helps (no one là đại từ bất định nên chia số ít)
4. will disappear (câu đk loại 1)
5. won’t go (câu đk loại 1)
6. is (câu đk loại 1 với mệnh đề chính đảo lên trước mệnh đề If)
7. provoke (câu đk loại 1)
8. won’t be
9. will stay
10. will be
`III`.
1. If we don’t leave now, we will miss the plane
2. If you aren’t careful, you may fall
3. If you don’t hurry up, we’ll be late for the concert
4. Unless we try to save them, our sources of energy will soon end
5. Unless you keep your feet dry, you will catch a cold (Unless = If not)
6. Unless she works harder, she’ll lose her job