On the other hand it's perfectly possible that they did know.

It would be perfectly possible for me to do so.

It's perfectly possible for the English theatre to make a lot of money.

It is perfectly possible that he will never come out again.

That seemed to me to be taken for granted and perfectly possible.

The second is perfectly possible in so far as the things he wants to do don't damage others.

He said that growth of 2.5 percent was "perfectly possible."

To his relief, he found this perfectly possible to do.

It is perfectly possible to have responsibility without being to blame.

I imagined it was perfectly possible to do all three in there.