The possibility had to be confirmed, or eliminated."
It was necessary that it be confirmed or ruled out as a possibility.
There was a possibility that it was the case, but it wasn't very important to figure it out, and to do so would have been to waste time solving idle puzzles.
I'm not sorry for these people.
the surfer is wearing a pink shirt
The sweater is red.
Several men are standing outside in the open air.
Oh I am already done.
The room is full of people who understand the concept.