1.if it rains, they will get wet

2.if You are good, I will give you a bar of chocolate.

3.if you bring the bell, the servant will come

4.if it is nice tomorrow, we will go boating up the river

5.if my brother has enough money, he will buy a new bicycle.

6. if they use so much pesticide, the river will be polluted.

7.if people travel more by public transportation, the exhaust fume won't have in big cities.

8.if we start at 6.00, we will arrive there before soon.

9.if the boy eats so many green apples, he will be ill.

10.if you join an English speaking club, your speaking will be improved soon.

Good luck !