1. I don’t know the answer, so I can’t tell you. → If …………………………………………….……….. 2. We got lost because we didn’t have a map. → If …………………………………….……..…….…… 3. Susan felt sick because she ate four cream cakes. →……………………………………………..…… 4. Without this treatment, the patient would have died. →……………………………………….….…... 5. He lost his job because he was late every day. →………………………………………………...…… 6. Peter is fat because he eats so many chips. →……………………………………………………...….. 7. Robert got a bad cough because he started smoking cigarettes. →………………………………..…..

1. I don’t know the answer, so I can’t tell you.
→ If I know the answer, I will tell you.
2. We got lost because we didn’t have a map.
→ If we had had a map, we wouldn't have got lost
3. Susan felt sick because she ate four cream cakes.
→If Susan hadn't eaten four cream cakes, she wouldn't have felt sick.

4. Without this treatment, the patient would have died.
→If we hadn't had this treatment, the patient would have died.
5. He lost his job because he was late every day.
→If he hadn't been late every day, he wouldn't have lost his job.
6. Peter is fat because he eats so many chips.
→If Peter ate less chips, he wouldn't be fat.
7. Robert got a bad cough because he started smoking cigarettes.
→If Robert hadn't started smoking cigarettes, he wouldn't have got a bad cough.

CT chung:

Câu điều kiện loại 3 
*Cấu trúc: If + S + Had + V(pp)/Ved, S + would/ could…+ have + V(pp)/Ved

Câu điều kiện loại 1:

*Cấu trúc: If + S + V(s,es), S + Will/Can/shall…… + V