Ответ:
1.If he supports us, we will win.
2.If we ask people, a lot of them wil volunteer.
3.She wil boycott the shop, if it sells violent video games.
4.People won't know about it if we don't organize a meeting.
5.If you ban cars from the town centre, the shopkeepers won't be happy.
6.I won't sponsor you if you don't finish the race.