YOU SAID:
The party starts when I walk in
INTO JAPANESE
わたしが来たときパーティーはもうかなり進んでいた。
BACK INTO ENGLISH
The party was well along when I come.
INTO JAPANESE
わたしが来たときパーティーはもうかなり進んでいた。
BACK INTO ENGLISH
The party was well along when I come.
That didn't even make that much sense in English.