YOU SAID:

itsy bitsy spider when up the spider spout down went the rain.

INTO JAPANESE

蜘蛛の噴出口を上に降りると、ちっちゃなクモが雨になりました。

BACK INTO ENGLISH

As I descended from the spider spout, a tiny spider became rainy.

INTO JAPANESE

蜘蛛の注ぎ口から降りると、小さな蜘蛛が雨になりました。

BACK INTO ENGLISH

When I got off the spider's spout, it rained on a small spider.

INTO JAPANESE

蜘蛛の注ぎ口を降りると、小さな蜘蛛に雨が降った。

BACK INTO ENGLISH

When I got off the spider's spout, it rained on a small spider.