`3` If he didn't smoke too much , he could get rid of his cough .

`4` If I didn't feel tired , I could play football this afternoon .

`5` If Olga and Ivan had been playing attention , they would have seen the sign marking their exit from the highway .

`6` If she had a college degree , she could be employed .

`7` If she hadn't walked to the meeting , she wouldn't have been late .

`8` If you don't promise to return back , I won't lend you .

`9` If the weather hadn't been terrible , we wouldn't have put off our trip .

`10` If Sally hadn't been absent from school on Friday , she would have known what she had to do for homework .

`@` Câu điều kiện loại `1` : If + S + V(s,es) + O , S + will + V-inf + O .

`@` Câu điều kiện loại `2` : If + S + were/V(quá khứ) + O , S + would/could + V-inf + O .

`@` Câu điều kiện loại `3` : If+ S + had + V3/Vpp + O , S + would/could + have + V3/Vpp + O .