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。の英語

To hear him speak English, you would take him for an American.

To hear him speak English, you would take him for a native.

To hear him speak English, you would take him for a native speaker.

To hear him speak English, you would take him for an Englishman.

He speaks English as if he were an American.

To hear him speak English, you would take him for a native.

If you heard her speak English, you would take her for an American.

I often listened to him speak in English.

Hearing him speak English, one would take him for an Englishman.

To hear him speak, you'd take him for a foreigner.

To hear him speak English, you would mistake him for an Englishman.

He speaks English as fluently as if he were an American.

To hear him speak English, one would take him for an Englishman.

To hear him speak English, you'd think he was [you would take him for] British.

I think that he can probably speak English.

He is a Japanese person who can speak English well.

To hear her speak English, you would take her for an Englishwoman.

I have never heard him speak English.

He has to speak English.

He speaks English like a native.

To hear him talk, you would take him for a foreigner.

I have become able to understand his English well.

He makes glaring mistakes in speaking English.

Everyone knows that he speaks English well.

He can't speak English, can he?

Nobody knows how much he can speak English.

Does he speak English?

Can he speak English?

He is superior to the rest in so far as he can speak English.

To hear him speak English, you would take him for a native.