1)i (call) you as soon as i (get) home. 2)if you (not come) inside now,you (miss) the programme. 3)they (not let) you in if you (not be) over 18.

1.  I'll call you as soon as I get home.
2.  If you don't come inside now, you'll miss the programme.
3.  They won't let you in if you are not over 18.