Explanation
Means 'without even doing'.
Formation
Verb (masu stem) + もしないで
Detailed explanation
This pattern is used to express that one has not done (or not even tried to do) some action before proceeding to do something else. It emphasizes doing something 'without even' doing the prior action.
Examples
調べもしないで、答えを書きました。
Shirabe mo shinai de, kotae o kakimashita.
I wrote the answer without even investigating.
彼は試験を勉強もしないで、テストに合格した。
Kare wa shiken o benkyou mo shinai de, tesuto ni goukaku shita.
He passed the test without even studying.
彼女はその本を読みもしないで、レポートを書いた。
Kanojo wa sono hon o yomi mo shinai de, repooto o kaita.
She wrote her report without even reading the book.
準備もしないで、プレゼンテーションを始めました。
Junbi mo shinai de, purezenteeshon o hajimemashita.
He started the presentation without even preparing.
Practice
Grammar content sourced from hanabira.org.