21 If you didn't drink too much coffee, you could sleep
22 If you press this button, you can stop the machine
23 If you make me some coffee, I'll give you one of my biscuits
24 Unless you had told me about Sue's hair, I wouldn't have noticed
25 If you should see Peter, tell him he should be here at 8.00
26 If you were to ask me to marry you, I wouldn't accept it
27 If you work so much, you will be tired
28 If only I hadn't drunk so much last night
29 Supposing that there were an earthquake, what would you do
30 You do the shopping and I will cook lunch
31 If you were to find some buried treasure, what would you do?
32 But for Pauline's interest, the project would have been abandoned
33 If you happened to find my wallet, could you let me know?
34 If it hadn't been for night-watchman, the fire wouldn't have been brought under control
35 If a detective hadn't recognized Dick, he wouldn't be in prison
36 If he had the money, he could afford a new car
37 If Susan hadn't eaten 4 cream cakes, she wouldn't have felt sick
38 If we had known your phone number, we could have contacted you
39 If the price of petrol hadn't been raised last month, car sales wouldn't have dropped again
40 If I didn't have a date with my old classmate, I could go to the beach with you this weekend
