This is the 2905th most frequent Korean word.
준비하는
"Preparing" or "getting ready."
The word '준비하는' is used as a present participle to describe the ongoing act of preparation for the party.
파티를 준비하는 것이 재미있어요.
Preparing for the party is enjoyable.
In this case, '준비하는' provides a description of the friends engaged in the act of preparation, in which assistance was given.
우리는 저녁을 위해 음식을 준비하는 친구를 도왔습니다.
We helped our friends who were preparing food for dinner.
Here, '준비하는' is used as part of a descriptive phrase indicating the action being performed currently in the context of packing luggage.