1.
1 If you mix red and blue you get purple.
2 Will the glass break if you heat it?
3 If you don't eat you will get thin.
4 When the weather is nice I will walk to work.
5 Will your brother help you with your homework when he has time?
2.
1 come/ will have
2 rains/ might stay
3 Will you post/ aren't
4 should apologize/ is
5 invites/ won't come
6 don't know/ ask
7 will move/ finds
8 doesn't stops/ will see
3.
1 will give
2 will make
3 doesn't come
4 goes
5 aren't
6 will be