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に乗ってた

was riding; was on

→ に
phrase Rare #22,506
was riding; was on Casual contraction of に乗っていた, used for being in or riding on a vehicle. In the expression 図に乗ってた, it can mean “was getting carried away” or “was taking advantage.”
JA: 昨日はずっと電車に乗ってた。
EN: I was on the train all day yesterday.

あのバスに乗ってたよ。

I was on that bus.

列車に乗ってた？

Were you on the train?

エレベーターに乗ってたあなた

You were in the elevator.

— エブリシング・エブリウェア・オール・アット・ワンス (2022)

同じバスに乗ってたの家までずっとついてきたのよ

The person who was on the same bus followed me all the way home.

— バジュランギおじさんと、小さな迷子 (2015)

電車に乗ってた？

Were you on the train?

図に乗ってた。

I was getting carried away.

旅行中はどんな自転車に乗ってたの？

What kind of bike were you riding while you were traveling?

トムはメアリーとバスに乗ってたんだ。

Tom was riding the bus with Mary.