Introducing People Around You

この人は誰ですか [kono hito wa dare desu ka]
Who is this person?

• この人は [kono hito wa] means "as for this person"
• 誰ですか [dare desu ka] means "Who is it?"

• その人は誰ですか [sono hito wa dare desu ka] means "Who is that person?"
• あの人は誰ですか [ano hito wa dare desu ka] means "Who is that person (over there)?"

この人は先生です [kono hito wa sensei desu]
This person is a teacher.

• 先生です [sensei desu] means "S/he is a teacher."

• その人は先生です [sono hito wa sensei desu] means "That person is a teacher."
• あの人は先生です [ano hito wa sensei desu] means "That person (over there) is a teacher."

あの人は俳優ですか [ano hito wa haiyū desu ka]
Is this person an actor?

• 俳優ですか [haiyū desu ka] means "Is s/he an actor?"

• A: この人はだれですか [kono hito wa dare desu ka]
  Who is this person?
• B: 先生です
  He's a teacher.
• A: あの人はだれですか [ano hito wa dare desu ka]
  Who's that person over there?
• B: 歌手です
  She's a singer.