YOU SAID:

My teacher doesn't know I'm doing this

INTO JAPANESE

私の先生は、これをやっている知らない

BACK INTO ENGLISH

My teachers are doing this do not know

INTO JAPANESE

先生はこれをやっているか分からない

BACK INTO ENGLISH

I don't know what teachers are doing this

INTO JAPANESE

どのような教師がこれをやっているのかわからない

BACK INTO ENGLISH

I don't know what teachers are doing this