YOU SAID:

I was at the disco party and i was dancing on the dance floor

INTO JAPANESE

私はディスコパーティーにいて、ダンスフロアで踊っていました

BACK INTO ENGLISH

I was at a disco party and I was dancing on the dance floor

INTO JAPANESE

私はディスコパーティーにいて、ダンスフロアで踊っていました

BACK INTO ENGLISH

I was at a disco party and I was dancing on the dance floor