YOU SAID:

hello this is the only thing i know in this language

INTO JAPANESE

こんにちは私はこの言語を知っている唯一のものです。

BACK INTO ENGLISH

Hi my is the only thing you know this language.

INTO JAPANESE

こんにちは私はこの言語を知っている唯一のもの。

BACK INTO ENGLISH

Hello I am the only one that knows this language.

INTO JAPANESE

俺しか知らない。

BACK INTO ENGLISH

I'm the only one that knows it.

INTO JAPANESE

俺しか知らない。

BACK INTO ENGLISH

I'm the only one that knows it.