Oftentimes you would use an indefinite determiner (a(n), some, Ø) when introducing an item as new information. And I have been thinking of use of determiners when introducing a new item in plural. In the following conversations, I feel B could say either some or Ø determiner (Ø article), and sound natural. What do you say?  A: Okay, choose something from this box. Does everyone have something in your hands? B: (1-1) Yes, I have some pens. (1-2) Yes, I have pens.  (Showing weirdly-shaped pens to a friend) B: (2-1) These are some pens. (2-2) These are pens.