わたしは とうきょうへ、むかし の ともだち に あい に いきました。
The correct answer is "ともだち" (tomodachi). This noun means "friend." It is modified by "むかしの" (mukashi no, old/former) to form "old friend." This friend is the person you went to Tokyo to meet. The verb "あいます" (aimasu, to meet) takes the particle "に" for the person one meets, and its stem "あい" followed by "に" expresses purpose. "むかし" is a noun meaning "old times." "の" is a particle connecting nouns. "に あい" is the purpose phrase, meaning "to meet."
正解(せいかい)は「ともだち」です。「むかしの」によって修飾(しゅうしょく)され、「むかしのともだち」となります。会(あ)う目的(もくてき)の相手(あいて)です。「むかし」は名詞(めいし)、「の」は名詞(めいし)をつなぐ助詞(じょし)です。「にあい」は目的(もくてき)を表(あらわ)す「会(あ)いに」で、動詞(どうし)の語幹(ごかん)と助詞(じょし)「に」で構成(こうせい)されます。
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