bikinkan percakapan aktif dan pasif

Yonda: Hi Karin.
Karin: Hello Yonda. 
Yonda: I heard from Susi that you sell cute pencil cases.
Karin: Yes, but sorry, if you want to buy it, it's sold right now.
Yonda: Hm... who bought all the pencil case? 
Karin: Dina bought all of the pencil cases for her sisters.
Yonda: So, all the pencil cases were bought by her?
Karin: Yup. But I'll bring the new one tomorrow.
Yonda: Oh I see. Then I'll buy it tomorrow too.