If we don't hurry, we'll be late.
If I'm able to get a flight, I'll fly home on Sunday.
If you come home late tonight , please, come in quietly.
If I don't feel well tomorrow, I will not arrive at the office.
If you have any problems, I'll do my best to help you.
If I'm late this evening, don't wait for me.
If it doesn't rain , we'll play tennis.