Can someone explain the use of determiners (words like some or the) for the word beans in the following dialogue:
Aki: Lisa, here're some beans.
Lisa: Why are you giving me beans?
Aki: Because it's Setsubun today. It means the "Coming of Spring".
Lisa: OK, but why the beans?
Aki: We throw beans on this day so that bad luck will leave and good luck will come in.
In particular, I'd like to know:
- Why does Lisa drop the determiner (why are you giving me ø beans) when she asks her first question?
- Why does Lisa then introduce a determiner (why the beans) when she repeats her question?
- Aki also drops the determiner (we throw ø beans) when she explains the custom. Is it for the same reason as 1, or for an entirely different reason?