は去年

last year

→ は
phrase Common #3,842
last year は marks the topic; 去年 means “last year.” This phrase commonly appears after a person or other topic when describing something that happened last year.
JA: 私は去年日本へ行きました。
EN: I went to Japan last year.

ヘレンは去年高校を卒業した

Helen graduated from high school last year.

は去年日本にいました

Ken was in Japan last year.

トムは去年学校を辞めたんだよ

Tom dropped out of school last year.

トムは去年数週間入院してたんだ

Tom was in the hospital for a few weeks last year.

トムは去年メアリーの彼氏だった

Tom was Mary's boyfriend last year.

今年のファッションは去年とはまったく違う

This year's fashion is completely different from last year's.

トムは去年買ったジーンズ入らない

Tom can't fit into the jeans he bought last year.

今年の流行は去年とはまったく違う

This year's trend is completely different from last year's.

トムは去年ボストンにいたの

Was Tom in Boston last year?