You never know what will happen.
There is no telling what will happen.
I don't know what'll happen.
There is no telling what may happen next.
Nobody knows what may happen.
There is no knowing what may happen.
You never know what'll happen.
I don't know what'll happen.
You never can tell what is going to happen.
You never can tell what's going to happen.
No matter what happens.
Whatever may betide.
What would happen?
Something is likely to happen.
There is no telling what will happen tomorrow.
There is no knowing what may happen.
Nobody knows what will happen next.
I don't mind how that turns out.
Whatever may happen, we must stick together.
I wonder what will become of him.
You never can tell what will happen in the future.