ずに
(Zu ni)
Indicates that an action is performed without doing another action.
Connection rules
- +Verb (ない-stem) + ずに
- +する becomes せずに
Examples
1.
昨日は忙しくて、夜十時まで何も食べずに働いた。

Kinou ha isogashiku te, yoru juu ji made nani mo tabe zu ni hatarai ta.
Yesterday was busy, so I worked until ten at night without eating anything.
「Late night work grind」
2.
辞書を使わずに日本語の新聞を読みました。

Jisho wo tsukawa zu ni nihongo no shinbun wo yomi mashi ta.
I read the Japanese newspaper without using a dictionary.
「Studying impressive skills」
Practice
I studied all night without sleeping.
一晩中___勉強しました。
Romaji also accepted