YOU SAID:
i jumped sadly on the trampoline.
INTO JAPANESE
私はトランポリンに悲しそうに飛び乗った。
BACK INTO ENGLISH
I jumped sadly on the trampoline.
INTO JAPANESE
私はトランポリンで悲しそうに飛び乗った。
BACK INTO ENGLISH
I jumped sadly on the trampoline.
That didn't even make that much sense in English.