1. Mary doesn't see the sight. She can't tell you about that. If.... 2. It wasn't fine yesterday. We didn't go for a walk. If.. . 3. I saw it with my own eyes. I believed it. If.. . 4. The accident happened because the driver didn't see the stop sign. If.. .. 5. You can't come late or they won't let you in. If..... 6. I don't know Greek, so I can't tell you about that. If.... 7. Gravity keeps people from being hurled off the earth as it whirls around. If.. . 8. Stop talking or you won't understand the lesson. If.. . 9. The church bells keep me from sleeping. If.... 10 Go right now or you'll be late for the train If....

`-` Cấu trúc: V+ O, or (else)+ S+ will ( not)+ V

`≈` If+ you don't+ V+ O, S+ will ( not)+ V

`-` Câu điều kiện loại `2`: Hiện tại không có thật

`+` If-clause: chia QKĐ

`+` Main clause: would/ could/ should/ might+ V

`-` Câu điều kiện loại `3`: Quá khứ không có thật

`+` If-clause: chia QKHT

`+` Main clause: would/ could/ should/ might+ have+ Vpp

`1`. If Mary saw the sight, she could tell you about that

`2`. If it had been fine yestreday, we would have gone for a walk.

`3`. If I had seen it with my own eyes, I would have believed it.

`4`. If the driver had seen the stop sign, the accident wouldn't have happened.

`5`. If you come late, they will not let you in.

`6`. If I knew Greek, I could tell you about that.

`7`. If gravity didn't keep people, the earth would hurled they off.

`8`. If you don't stop talking, you won't understand the lesson.

`9`. If the church bells didn't ring, I would sleep.

`10`. If you don't go right now, you'll be late for the train.