YOU SAID:
A leaf fel down a tree, now it compost
INTO JAPANESE
葉が木に落ち、今では堆肥になっています
BACK INTO ENGLISH
The leaves fell on the tree and now it is composted
INTO JAPANESE
葉が木に落ち、今は堆肥になっています
BACK INTO ENGLISH
The leaves fell on the tree and now it is composted
That didn't even make that much sense in English.