＜Key phrase１＞
ここ・そこ・あそこ・どこ
１）ここ・・・Koko is a pronoun for the location near the speaker. <here>
２）そこ・・・Soko is a pronoun for the location closer to the spoken to than the speaker. <there>
３）あそこ・・・Asoko is a pronoun for the location distant from both the speaker and the person to. <over there>
＜Key phrase２＞
ここ・そこ・あそこ は N です。
EX： ここ は 図書館 です。（ This place is the library. ）
This sentence pattern is used to describe what the being pointed to is.
Place nouns which are used in this pattern include such word as 図書館、郵便局、スーパー、コンビニ、、、
＜Key phrase３＞
N は どこ ですか。
どこ・・・Doko is an interrogative asking where N is located, <where>
EX：図書館 は どこ ですか。（ Where is the library? ）
A：図書館はどこですか。（ Where is the library? ）
B：✔️図書館はあそこです。（ The library is over there. ）
✔️あそこです。