1. If the train’s late, we (walk). –> If the train’s late, we will walk.

2. She (call) you if she (have) time. –> She will call you if she has time.

3. If it costs too much, I (buy) a smaller one. –> If it costs too much, I will buy a smaller one.

4. If the doctor can’t see me, I (go) somewhere else. –> If the doctor can’t see me, I will go somewhere else.

5. If the class (be) full, we (find) another one. –> If the class is full, we will find another one.

6. What will we do if the taxi (not come)? –> What will we do if the taxi doesn’t come?

7. Will you phone me if there (be) any problems? –> Will you phone me if there are any problems?

8. I (ask) Peter if I (see) him tomorrow. –> I will ask Peter if I see him tomorrow.