YOU SAID:

This is so cool that I slapped my brother

INTO JAPANESE

これはとてもクールだ、私は私の弟を平手打ち

BACK INTO ENGLISH

This is very cool, I slap my brother's

INTO JAPANESE

これは非常にクールな私の弟を平手打ち

BACK INTO ENGLISH

It's a very cool my brother slapped

INTO JAPANESE

それは非常にクールな弟を平手打ち