"Necessary things" is just a garden variety noun with an adjective in front of it. " I think everything here is correct. I confess I don't see how your second category ("verbs") differs from your first.
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AvangiSomeone must have some rules which explain why sometimes the noun sounds better following, and other times sounds better preceding.
paul_hpositioning of adjectives and participles ... put the adjective behind the noun if something follows ...That's generally the way it works. If the adjective (or participle) has a complement, you have to place the group after the noun. You can't place the whole group before the noun. The simple adjective goes to the left of the noun.