YOU SAID:
the first time i went to my girlfriends house, i fell out of a tree, onto my head.
INTO JAPANESE
初めてガールフレンドの家に行ったとき、私は木から頭に落ちました。
BACK INTO ENGLISH
The first time I went to my girlfriend's house, I fell from a tree to my head.
INTO JAPANESE
初めてガールフレンドの家に行ったとき、私は木から頭に落ちた。
BACK INTO ENGLISH
The first time I went to my girlfriend's house, I fell from a tree to my head.
That didn't even make that much sense in English.