1.    If we miss/ will miss the bus, we take/ will take the taxi.
2.     If you don't eat/ won't eat fruit, you get/ will get a cold.
3.     If you help/ will help me, I lend/ will lend you that Beyoncé CD.
4.     If he doesn't stop/ won't  stop smoking, he has/ will have  problems later. 
5.     You are/ will be on time if you run/ will run.
6.     She goes/ will go to the party if you invite/ will invite her. 
7.    They see/ will see the new Lara Croft film if they go/ will go to the cinema. 
8.     I come/ will come over to your house if you rent/ will rent a DVD.