YOU SAID:

When it rains, it poors.

INTO JAPANESE

雨が降ると、貧乏になります。

BACK INTO ENGLISH

When it rains, it becomes poor.

INTO JAPANESE

雨が降ると、貧しくなります。

BACK INTO ENGLISH

It will become poor if it rains.

INTO JAPANESE

雨が降ると貧弱になります。

BACK INTO ENGLISH

It will become poor if it rains.