YOU SAID:

I am a really good friend.

INTO JAPANESE

私は本当に良い友達です。

BACK INTO ENGLISH

I'm a really good friend.

INTO JAPANESE

本当に良い友達だよ。

BACK INTO ENGLISH

He's a really good friend.

INTO JAPANESE

彼は本当に良い友達だよ。

BACK INTO ENGLISH

He's a really good friend.