=>
1. They plan to make this beach a clean and beautiful place again.
-> plan to V ~ intend to V : dự định
2. If we use the car all the time, we will make the air dirty.
-> câu đk loại 1 If S Vs/es, S will V
3. Unless I leave now, I'll miss the train.
-> unless = if not
4. If I don't have a quiet room, I won't be able to do anything.
-> unless = if not
5. If you don't hurry up, you will be late for school.
-> câu đk loại 1 If S Vs/es, S will V
6. If you don't study harder, you won't pass the exam.
-> câu đk loại 1 If S Vs/es, S will V (unless ~ if not)