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彼が英語を話すのを聞けば

if you hear him speak English

→ 彼
phrase Rare #40,531
if you hear him speak English Uses the conditional form 聞けば to mean “if you hear.” The listener is usually understood from context.
JA: 彼が英語を話すのを聞けば、驚くと思います。
EN: If you hear him speak English, I think you'll be surprised.

彼が英語を話すのを聞けば、イギリス人と間違えるだろう。

If you heard him speak English, you’d mistake him for a Brit.

彼が英語を話すのを聞けば、アメリカ人だと思うでしょう。

If you heard him speak English, you would think he was American.

彼が英語を話すのを聞けば、彼が英語を母語とする人だと思うだろう。

If you heard him speak English, you’d think he was a native speaker.