英文造句 ： 問 文法，有關一句字中，若 「Prep」的後面，不接 名詞或動名詞！可否 「成句」，且符合 文法? 如 I never go on(prep). He was never late before(prep).?

I never go on(adverbial particle); He was never late before (adverb). Yip

查閱辭典的例句如下。
例1. (Is) anything going on?
例2. The search for the missing went on.
例3. These gloves won't go on.
例4. I have seen that picture before.
例5. I had met her five years before.
例6. Begin at noon, not before.
例7. He has never been to the US before.

"on" can be preposition or adverb. "before" can be preposition, adverb or conjunction.

Both "on" and "before" as shown in your examples are adverb instead of preposition.