giúp mình đi , khó quá 
1. We must leave now , or we will miss the plane
=> If we don't
2. Be careful or you many fall
=> If you
3. Hurry up or we'll be late for the concert
=> If
4. Oủ sources of energy will soon end if we don't try to save them
=> Unless
5. You will catch a cold if you don's keep your feet dry
=> Unless
6. Unless we protect the envirmonent , we will destroy ourselves
=> If
7. Unless she is more hard - working , she will get low marks
=> If
8. Unless he listens to his parents , he will fail
=> If
Mình cảm ơn trước 
1. We must leave now , or we will miss the plane
=> If we don't leave now , we will miss the plane
2. Be careful or you many fall
=> If you are careless , you may fall
3. Hurry up or we'll be late for the concert
=> If we don't hurry up , we will be late for the concert
4. Oủ sources of energy will soon end if we don't try to save them
=> Unless we try to save our sources of energy , it will soon end
5. You will catch a cold if you don's keep your feet dry
=> Unless you keep your feet dry , you will catch a cold
6. Unless we protect the envirmonent , we will destroy ourselves
=> If we don't protect the eviroment , we will destroy ourselves
7. Unless she is more hard - working , she will get low marks
=> If she isn't more hard-working , she'll get low marks
8. Unless he listens to his parents , he will fail
=> If he doesn't listen to his parents , he will fail
1. We must leave now , or we will miss the plane
=> If we don't leave now, we will mis the plane.
2. Be careful or you many fall
=> If you aren't careful, you'll fall.
3. Hurry up or we'll be late for the concert
=> If you don't hurry up, you'll be late for the concert.
4. Our sources of energy will soon end if we don't try to save them
=> Unless we try to save our sources of energy, they will soon end.
5. You will catch a cold if you don's keep your feet dry
=> Unless you keep your feet dry, you will catch a cold.
6. Unless we protect the envirmonent , we will destroy ourselves
=> If we don't protect the envirmonent, we will destroy ourselves
7. Unless she is more hard - working , she will get low marks
=> If she isn't more hard working, she will get low marks.
8. Unless he listens to his parents , he will fail
=> If he doesn't listen to his parents, he will fail.