It's impossible for you to control anyone else's life and death.
She would never understand why anything further was impossible for him.
It should have been impossible for anyone to approach me.
It is impossible for any one country to do everything.
And then you went out of your way to make things absolutely impossible for me!
Being college teachers, it would have been almost impossible for them not to.
I put myself in his place, a thing impossible for you.
It would have been impossible for the Americans to learn a thing about them.
Quite impossible for any girl to use such a thing, of course.
A baby then would have been impossible for them both.