"This is just impossible at the end of the 20th century."

I've gone my whole life doing things that were seemingly impossible at the time.

It was impossible at first to guess the nature of the animal.

However, it would seem that is impossible at this point.

It is impossible at this moment to know if these guys are telling the truth.

Such a pattern of events was not impossible, at the very least!

It was going to be almost impossible at that hour of the night.

It was impossible at that time, they learned, for information on the subject to be given.

It was impossible at first to tell how many, but she knew she'd brought some of them into the world herself, only hours before.

He won, 15-4, which is almost impossible at that high level.