YOU SAID:

two kitten sitting on the tree, on fell off

INTO JAPANESE

木の上に座っている2匹の子猫が落ちた

BACK INTO ENGLISH

Two kittens sitting on a tree fell

INTO JAPANESE

木に座っている2匹の子猫が倒れた

BACK INTO ENGLISH

Two kittens sitting on a tree fell down

INTO JAPANESE

木の上に座っている2匹の子猫が倒れた

BACK INTO ENGLISH

Two kittens sitting on a tree fell down