YOU SAID:
The party had just begun when it started to rain
INTO JAPANESE
雨が降り始めたとき、パーティーは始まったばかりだった
BACK INTO ENGLISH
The party was just beginning when it started to rain
INTO JAPANESE
雨が降り始めたとき、パーティーは始まったばかりだった
BACK INTO ENGLISH
The party was just beginning when it started to rain
You've done this before, haven't you.