YOU SAID:
i am sad because of us
INTO JAPANESE
私は私たちのために悲しい
BACK INTO ENGLISH
I'm sad for us.
INTO JAPANESE
私は私たちのために悲しんでいる。
BACK INTO ENGLISH
I am sad for us.
INTO JAPANESE
私は私たちのために悲しい。
BACK INTO ENGLISH
I am sad for us.
That didn't even make that much sense in English.