EX1. 

1. We will do this for you if you want.

2. If we need some halp, we will ask.

3. If Peter stays with his grandparents, Susan will be happy.

4. If you win th money, we will buy a new house

.5. She will write to you if she leaves.

6. We will go on holiday if there is time.

EX2.

1. If we miss/will miss the bus, we take/will take the taxi.

2. I come/will come over to your house if you rent/will rent a DVD.

3. They see/will see the new Lara Croft film if they go/will go to the cinema.

4. She goes/will go to the party if you invite/will invite her.

5. You are/will be on time if you run/will run.

6. If he doesn't stop/won't stop, he has/will have problems later.

7. If you help/will help me, I lend/will lend you that Beyonce' CD.

8. If you don't eat/won't eat fruit, you get/will get a cold.