I came across this question today.
Q: the correct expression for blank.
The documents ____ immediate attention are on top.
1. Requiring 2. To require
I know the answer is 1. Requiring, however I don't know why number 2 can't be an answer.
As far as I know, a to-infinitive can define a noun, like "books to read," so to me, number 2 can be an answer. But at the same time, I know "documents to require" looks very awkward. I just don't know why. Could you help me?