YOU SAID:

i am fun, my brother is not

INTO JAPANESE

私は楽しいです、私の弟はそうではありません

BACK INTO ENGLISH

I have fun, my brother does not

INTO JAPANESE

私は楽しんでいますが、弟はそうではありません

BACK INTO ENGLISH

I have fun, but my brother does not

INTO JAPANESE

私は楽しんでいるが、弟はそうではない

BACK INTO ENGLISH

I have fun, but my brother does not