People often say, "that is a nice thing to do!" But when I thought this question over, this thought occurred to me: Why don't we say " That is a thing nice to do"?
My reason is as follows. We often say "boys reading under trees," not "reading boys under trees." Not that the second one is flawed or anything, but it is just the way it is. Then my question is, why don't we say "thing nice to do"?