YOU SAID:

You knew I had to do it to them

INTO JAPANESE

あなたが彼らにそれをしなければならなかった知っていた

BACK INTO ENGLISH

You had to do it they knew

INTO JAPANESE

彼らは知っていたそれをしなければならなかったら

BACK INTO ENGLISH

They had to know it

INTO JAPANESE

全部知っている

BACK INTO ENGLISH

They seem to know it all.

INTO JAPANESE

全部知っている

BACK INTO ENGLISH

They seem to know it all.