IF 从句 可以这样省略吗

问题描述:

IF 从句 可以这样省略吗
我有个问题想求救下!
If you play football well ,you can join us.
可以改为 Playing football well,you can join us 因为我看到从句主句 主语一致.

No.从句主句主语是一致的 but one is "ask" another one is "tell" can not take the "if" away.So "Play football well,and you can join us." is not good either,( Who?I can say "We play football well,and you...