高校の時

when I was in high school

→ 高校
phrase Rare #22,270
when I was in high school The subject is understood from context, so it can also mean “when you were in high school” or “during high school.”
JA: 高校の時、毎日自転車で学校に通っていました。
EN: When I was in high school, I rode my bike to school every day.

高校の時、人気者だった?

Were you popular in high school?

高校の時の?

From your high school days?

— ビッグ・シック ぼくたちの大いなる目ざめ (2017)

トムとは高校の時からの友達だよ。

Tom has been my friend since high school.

ジャクソンさんは、私が高校の時のフランス語の先生だったんです。

Mr. Jackson was my French teacher when I was in high school.

この本は、高校の時に読んだよ。

I read this book when I was in high school.

高校の時、一生懸命勉強しましたか?

Did you study hard when you were in high school?

トムは高校の時、なかなか優れたバスケットの選手だったんだ。

Tom was quite a talented basketball player in high school.

高校の時からここで働いてるんだ。

I've been working here since high school.

高校の時お父上が講演に来られた

When I was in high school, your father came to give a lecture.

— ア・フュー・グッドメン (1992)