1)Don't ask me how long I'll stay here.
2)I'll join you if I have free time.
3)They'll go to the beach when summer comes.
4)I don't know when the party will begin.
5)I can't be sure if the show will be a success.
6)We'll talk about it when I finish this work.
7)Everybody will be happy when they win.
8)They will certainly win if they train a lot.
1A, 2G, 3H, 4B, 5C, 6E, 7D, 8F