時、私は

when ..., I ...

→ 時
phrase Rare #21,377
when ..., I ... Used to begin a sentence describing what the speaker was doing or what happened when something else occurred. 時 means “when,” and 私は marks “I” as the topic.
JA: 駅に着いた時、私は母に電話した。
EN: When I arrived at the station, I called my mother.

電話が鳴った時、私はもう寝ていた

When the phone rang, I was already asleep.

トムここに来た時、私は不在だった

I was away when Tom came here.

その時、私は一人でした

At that time, I was alone.

家に着いた時、私はたいへん疲れていた

I was very tired when I got home.

その時、私はムニパキスタン連れて帰ろうと決心したんだよ

That’s when I decided to take Muni back to Pakistan with me.

— バジュランギおじさんと、小さな迷子 (2015)

から電話がかかってきた時、私は出かけようとしていた

When you called me, I was just about to leave.

彼がきた時、私は手紙を書いていた

When he came, I was writing a letter.

その時、私は一握りのお金しか持っていませんでした

At that time, I only had a handful of money.