YOU SAID:

Why do Japanese people speak Japanese

INTO JAPANESE

日本人はなぜ日本語を話す

BACK INTO ENGLISH

Speak Japan why Japanese

INTO JAPANESE

なんで日本人に日本を話す

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I speak Japanese Japan

INTO JAPANESE

日本を話すこと

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Japan to speak

INTO JAPANESE

いわば日本

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So to speak, Japan

INTO JAPANESE

いわば、日本します。

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In other words, Japan.

INTO JAPANESE

つまり、日本。

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In other words, Japan.