8 If she had learned hard, she wouldn't have failed the final exam
9 If you stop immediately, I won't call your teacher
10 If I had known Alice's telephone number, I could have phoned her
11 If I knew your decision, I could tell them
12 If the weather weren't so hot, we could go out
13 If she hadn't come late, she could have met him
14 If there were no sun, man would live in the darkness
15 If he didn't smoke, he wouldn't be so weak
16 If I hadn't been busy, I would have watched TV last night
17 If you don't stop talking, you won't finish the work on time
18 If he hadn't gone out in the rain last night, he wouldn't have had the flu
