The answers on this page are confusing me, or, I am confused by the answers ;D
To me, in English, new is an adjective either way, before or after, so one would say "Are those new machines?" and mean the same as "Are these machine new?" MagicofLA said if a word modifies another, it goes before, but the top of the page puts the modifier (adjective) after the noun, not before. Are they not saying the same thing both ways?