YOU SAID:

I was drawing when an alien came and invite me to go to the watermelon cows planet

INTO JAPANESE

エイリアンが来て、スイカの牛の惑星に行くように誘ったとき、私は絵を描いていました

BACK INTO ENGLISH

I was painting when the aliens came and invited me to go to the watermelon cow planet

INTO JAPANESE

エイリアンが来て、スイカの牛の惑星に行くように誘ったとき、私は絵を描いていました

BACK INTO ENGLISH

I was painting when the aliens came and invited me to go to the watermelon cow planet