一切vs所有 一切 is a demonstrative pronoun, often there is no 的 between 一切and the noun. They are words that we could classify. For exemple, 一切乐器，all instruments (all kinds of instruments), 一切困难, all difficulties, (all kinds of problems). 所有 is an adjective, means "all". We could say 所有的+n. or 所有 +n. as we want. Wether it's a word we can classify or not. We add 都 when there is a decription for "all of something". E.g., 所有字都写得非常整齐。