1. He doesn't have the money so he cannot afford to buy a new car

If had the money, he could afford to buy a new car.

Câu điều kiện loại 2: If + S + V-ed /V2, S + would / could / should + V

2. I wasn't hungry, so I didn't feel like eating.

If I had been hungry, I would have felt like eating.

Câu điều kiện loại 3: If + S + had V3/V-ed, S +would + have + V3/V-ed

3. The students studied carefully. They didn't want to fail in the exams

In order not to fail the exam, the students study carfully.

In order to V: để làm gì

4. Our English teacher has given us five midterm tests so far.

Five midterm tests have been given for us by our English teacher so far.

5. There were about 90 to 100 people at the concert last night. 

There were about 90 to 100 people at the concert last night, weren't they ?

Câu hỏi đuôi (tag question) dùng để khẳng định vấn đề 

6. The swimming pool didn't open until 10.45 a.m. yesterday.

It was not until 10.45 a.m. yesterday that the swimming pool opened

Cấu trúc It + is/was + not until + từ/cụm từ chỉ thời gian + that + S + V: mãi cho đến khi.. thì...

1. If he had the money, he could afford to buy a new car.

2. If I had been hungry, I would have felt like eating.

3. In order not to fail the exam, the students studied carefully.

4. Five midterm tests have been given to us by our teacher so far.

5. How many people were there at the concert last night?

6. It was not until 10.45 am. Yesterday that the swimming pool opened