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事実を知っていたら

if [someone] knew the fact

→ 事実
phrase Rare #40,751
if [someone] knew the fact The subject is usually understood from context. This conditional can describe a hypothetical situation.
JA: 事実を知っていたら、すぐに知らせます。
EN: If I knew the fact, I’d let you know right away.

もし彼が事実を知っていたら、事故は避けられただろう。

If he had known the truth, the accident could have been avoided.

もし彼がその事実を知っていたら、私に話してくれただろう。

If he had known that fact, he would have told me.

もし私が事実を知っていたら、言うだろう。

If I knew the truth, I would tell you.