When the main sentence is in the past, then both halves of the sentence definitely happened, so again, it is not a matter of if, but when.
海に行ったら、天気が良くなりました。
When we went to the beach, the weather turned out nice.
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When the main sentence is in the past, then both halves of the sentence definitely happened, so again, it is not a matter of if, but when.
海に行ったら、天気が良くなりました。
When we went to the beach, the weather turned out nice.