YOU SAID:

I cut down a tree today because it hit me in my head and I fell off the mower.

INTO JAPANESE

今日は頭にぶつかって芝刈り機から落ちたので、木を切り倒しました。

BACK INTO ENGLISH

I hit my head today and fell off the lawn mower, so I cut down a tree.

INTO JAPANESE

今日は頭をぶつけて芝刈り機から落ちたので、木を切り倒しました。

BACK INTO ENGLISH

I hit my head today and fell off the lawn mower, so I cut down a tree.