YOU SAID:

The part don't start til i walk in

INTO JAPANESE

私が入るまでパートは始まらない

BACK INTO ENGLISH

The party won't start until I enter

INTO JAPANESE

私が入るまでパーティーは始まらない

BACK INTO ENGLISH

The party won't start until I'm in

INTO JAPANESE

私が入るまでパーティーは始まらない

BACK INTO ENGLISH

The party won't start until I'm in