1. If he had taken my advice he wouldn't fail the exam
2. If you ate less you would lose weight
3.We'll send for the doctor if we had stomach-ache
4. If she practised more she would pass exam
5.If there isin't enough wine in that bottle I will have to buy more.
6.If you had checked the petrol before we started we wouldn't stay there
7.This clock wouldn't have run down if you changed battery
8.Try on the blue one if you like this colour
9.If these gates are locked we should have keys
10. If we leave before breakfast, our mother will be angry at ous.
11.If teh river rises any higher..
12.her life might have been saved if she had gone with sb
13.If the volcnao starts erupting people will be feared.
14.The grass would look better if you cut down it
15.Unless it is a nice day we won't go for a walk
16.If you don't put enough stamps on a letter, the person who gets it
17.He would lend it to you if you gave it back
18.Unless this hotel gets another cook we will stay here
19.If the storm becomes worse we should go back
20. If your uncle sees you will be happy