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していただろう

would have done

→ 為る
phrase Rare #43,203
would have done Used to describe what would probably have happened in a hypothetical past situation, often with an implied or stated condition.
JA: 時間があれば、もっと練習していただろう。
EN: If I’d had time, I would have practiced more.

きみが助けてくれていたなら、ぼくは成功していただろう。

If you had helped me, I would have succeeded.

君はよく勉強した、そうでなければ失敗していただろう。

You studied hard; otherwise, you would have failed.

彼の助けがなかったら君は失敗していただろう。

Without his help, you would have failed.

もし彼が彼女のアドバイスをもらっていたら、成功していただろうに。

If he had taken her advice, he would have succeeded.