Put in when or if.
I want you to come to the party but *** you don’t want to come, that’s all right.
Don’t worry if I’m late tonight.
Tom might phone while I’m out this evening. If he does, can you take a message?
I’m going to Rome next week. When I’m there, I hope to visit a friend of mine.
I think Jill will get the job. I’ll be very surprised if she doesn’t get it.
I’m going shopping. If you want anything, I can get it for you.
I’m going away for a few days. I’ll phone you when I get back.
I want you to come to the party but if you don’t want to come, that’s all right.
We can cat at home or, if you prefer, we can go to a restaurant.