ВОЙДИТЕ, ЧТОБЫ НАЧАТЬ ОБУЧЕНИЕ С АУДИО-ЗАПИСЬЮ

Grammar I - 02.01
これ それ あれ どれ
  When you want to talk about things you do not know the name of,
you can use such expressions as kore, sore, are, and dore?.
  Kore refers to something close to the speaker;
sore
refers to something close to the person you're talking to;
are
refers to an object that is neither close to the speaker or the listener.
あれ は わたし の ペン です。

That /thing/ is my pen over there.

are wa watashi no pen desu.

 
これ は 私 の ペン です。 This /thing/ is my pen.
kore wa watashi no pen desu.  
それ は わたし の ペン です。 That /thing/ is my pen.
sore wa watashi no pen desu.  
   
これ は いくら です か? How much is this?
kore wa ikura desu ka?  
   
それ は さん ぜん えん です。 That is 3,000 yen.

sore wa san-zen en desu.

 
   
  Dore can be used to express "which?"
どれ です か。

Which one?
Which one is it (that you are talking about??

dore desu ka?  
   
  Question words like dore and nani cannot be followed by the particle wa.
Instead, they must be followed by the particle ga.
どれ が あなた の ペン です か。 Which one is your pen?

dore ga anata no pen desu ka?