YOU SAID:

If it rains, it pours

INTO JAPANESE

雨が降ったら、それは注ぐ

BACK INTO ENGLISH

If it rains, it poured

INTO JAPANESE

雨が降ったら、注いだ

BACK INTO ENGLISH

When it rained, I poured it.

INTO JAPANESE

雨が降ったとき、私はそれを注いだ。

BACK INTO ENGLISH

I poured it when it rained.

INTO JAPANESE

私は雨が降ったらそれを注いだ。

BACK INTO ENGLISH

I poured it when it rained.