ABSTRACT
To indicate that someone is doing or did something for the first time, you can use the adverb はじめて “for the first time.”
1 7 才 じゅうななさい
の時 とき にはじめて1人
“I traveled alone for the first time when I was seventeen.” 僕 ぼく のお母
“I heard my mom used a personal computer for the first time in 1985.”