New answers tagged negative-forms
Strictly speaking the answer is no. Just the -ず ending by itself won't create anything "adverb-like". That's why it takes the "ni" particle (-ずに), to become adverb-like (just like 自由 jiyuu is freedom and 自由に jiyuu ni is freely). When you have a -ず ending you have a 連用形 ren'youkei, also known as ます形. It follows a negative base (未然形 mizenkei), but the ...
Yes. However, something to be careful of is 〜ず vs. 〜ずに: お役に立てず、申し訳ありません。 "We apologize for being unable to serve you." ✗お役に立てずに、申し訳ありません。 お礼も言わず（に）食べた。 "He ate without saying his thanks." I think you could say that 〜ず allows for exactly what なくて supports plus adverbial modification, while 〜ずに only allows for adverbial modification.
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