YOU SAID:

It was raining buckets by the time she got to the birthday bash.

INTO JAPANESE

彼女がバースデーバッシュに着く頃には、バケツが雨が降っていた。

BACK INTO ENGLISH

By the time she arrived at Birthday Bash, the bucket was raining.

INTO JAPANESE

彼女がバースデーバッシュに到着するまでに、バケツは雨が降っていました。

BACK INTO ENGLISH

By the time she arrived at Birthday Bash, the bucket was raining.