1. I wouldn't do that if I were you.

2. If I were rich I'd buy a yacht.

3. If I have the time I'll call you.

    If I had the time I would call you.

    If I had the time I called you.

4. I will come to the party if I can.

    I'd come to the party if I could.

    I would have come the the party if I could have.

5. When I was little, if my father got home early from work we would play ball before dinner.

6. If we don't have homework to do we watch TV.

7. If I had known about the concert I wouldn't have left early.

8. He cleans his apartment if he has company.

    He'd clean his apartment if he had company.

    He usually cleaned his apartment if he had company.

9. If he has the money he buys imported beer.

    If he had the money he would buy imported beer.

    If he had had the money he would have bought imported beer.

    If he had the money he bought imported beer.

10. If I have been short with you I'm sorry.

        If I offended you I didn't mean to.

        If I am rude it is because I have no manners.