I'll be careful. i wiil not break the cups. you have free time now.come for a walk with me. i'll go hiking in summer.i'll see a lot of interesting things. he'll ho shopping.he'll buy some exercise-book for me. -join two sentences into one using if.

If I'm careful, I will not break the cups.
If you have free time now, come for a walk with me.
If I go hiking in summer, I'll see a lot of interesting things.
If he goes shopping, he'll buy some exercise-books for me.