3. You’d better see a doctor about the problem. (IF) 4. I don’t have a camera with me now, so I can’t take any photos. (IF) 5. We have a car, so we don’t have any difficulty getting around. (IF) 6. Charlotte didn’t leave early, and so she missed the bus. (IF) 7. We forgot to take a map, so we got lost in the mountain. (IF) 8. I didn’t have my cellphone yesterday, so I couldn’t contact you. (IF)

`N`

`3.` If I were you, I would see a doctor about the problem.

`4.` If I had a camera with me now, I could take some photos.

`5.` If we didn't have a car, we would have difficulty getting around.

`6.` If Charlotte had left early, she wouldn't have missed the bus.

`7.` If we hadn't forgotten to take a map, we wouldn't have got lost in the mountain.

`8.` If I had had my cellphone yesterday, I could have contacted you.

`-` CĐKL 2 : If + S + V (quá khứ đơn), S + would/could/might + V-inf

`->` Diễn tả một điều kiện không có thật hoặc khó xảy ra ở hiện tại hoặc tương lai.

`*` ĐN : Were + S + V (qkd), S + would/might/could + V-inf 

`-` CĐKL 3 : If + S + had + V (quá khứ phân từ), S + would/could/might + have + Vpp

`->` Diễn tả một điều kiện không có thật trong quá khứ và kết quả giả định nếu điều kiện đó xảy ra.

`*` ĐN : Had + S + V (qkpt), S + would/might/could + have + Vpp 

`-` If not `=` Unless : trừ khi, nếu không thì ...