~はずがない (can't possibly)

That kind of thing can't possibly be good for your body, can it?

The light's on, so they can't have gone out.

She can't possibly be serious.

There's no way she would have lied to me.

There's no way she had good grades at school.

There's no way I could do something like that in public.

It can't possibly have rained during the night.

That can't be true.