=>

1. They are going to invite him for dinner tonight.

-> be going to V ~ intend to V : dự định làm gì

2. The tea isn't strong enough to keep us awake.

-> be adj enough to V : đủ...để

3. Why did Hoa go to school late this morning?

-> why + TĐT + S V? (why : tại sao)

4. You ought to revise the lesson carefully./You ought to be quiet./You ought to ask your teacher to explain the lesson again.

-> ought to V : nên làm gì

5. You must stay in bed because you are ill./Because you are ill, you must stay in bed.

-> because S V : bởi vì

6. Lan repaired the bicycle by herself.

-> by oneself : tự ai làm/một mình, tự mình