If you finish/do not finish...

[Tan Elaine]

If you do not finish your homework, you cannot go out with us.

If you finish your homework, you can go out with us.

Are both sentences correct and mean the same?

Thanks.

 

[Tdol]

They're fine.

 

[GoesStation]

They don't mean exactly the same thing. The first threatens a punishment; the second promises a reward.

 

[Rover_KE]

Are both sentences correct and do they mean the same?

In real life, we'd say don't and can't.