be done
To be finished or have completed something. I hope you're done writing that paper because class starts in three minutes.
be done with (someone or something)
To be finished with someone or something; to cease being involved or dealing with someone or something. I've been working on this essay for hours now, so I'm just going to write the conclusion and be done with it. That group has been a really negative influence in my life, so I've decided that I'm done with them altogether.
be done
To have finished something: Are you done with your homework yet? Are they done eating dinner?