When I was in high school, I was always sleeping during English class.
そう言いたいときは、
❶When I was...., I was always.....
または、
❷When I was...., I would always.....
という感じで文を作りましょう〜
例えば、
When I was in high school, I was always sleeping during English class.
(高校生の時、英語の授業はいつも寝ていた)。
When I was small, I would always make mud pies.
(小さい時、いつも泥パイを作っていた)。
When I was in junior high school, I was always watching “Friends.”
(中学生の時、いつも「フレンズ」を見ていた)。
と言えますよ、参考に!