If I don’t feel well tomorrow, I’ll stay at home.
Are you going out later? 一 If I go out, I’ll close the window.
Are you going out later? 一 Yes, I am. When I go out, I’ll close the window.
When I get home this evening, I’m going to have a shower.
If I’m late this evening, don’t wait for me.
We’re going to play tennis if it doesn’t rain.
If I can 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’m not going to work.
If you have any problems, I’ll try to help you.