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降っていた

was raining

→ 降る
phrase Common #3,489
was raining The past progressive form of 降る, used here for rain or snow that was falling over a period of time. In a conditional sentence, it can mean “if it is raining.”
JA: 朝から雪が降っていた。
EN: It had been snowing since morning.

雨がとてもひどく降っていたので、私たちは出発を延期しなければならなかった。

It was raining so heavily that we had to postpone our departure.

雨は絶え間なく降っていた。

The rain was falling incessantly.

おまけに雨まで降っていた。

To top it all off, it was raining too.

最近雨がひっきりなしに降っていたが、今日は天気がいいです。

It’s been raining nonstop lately, but the weather is nice today.

雨が一日中絶え間なく降っていた。

It rained continuously all day.