YOU SAID:
Rainbows won't light up the sky unless you let it rain.
INTO JAPANESE
雨が降らない限り、虹は空を照らしません。
BACK INTO ENGLISH
As long as it does not rain, the rainbow does not light the sky.
INTO JAPANESE
雨が降らない限り、虹は空を照らしません。
BACK INTO ENGLISH
As long as it does not rain, the rainbow does not light the sky.
That didn't even make that much sense in English.