moushikomisho ni yuubinbangou to atarashii juusho o kinyuushita tokoro desu.

to be

Breakdown of moushikomisho ni yuubinbangou to atarashii juusho o kinyuushita tokoro desu.

• を: direct object particle
• と: noun-connector particle
• 新あたらしい: new

Questions & Answers about moushikomisho ni yuubinbangou to atarashii juusho o kinyuushita tokoro desu.

Why is に used after 申込書?

Because 記入する usually marks the place/item you write into with に.

• 申込書に記入する = to fill something in on an application form
• Here, the things being filled in are 郵便番号 and 新しい住所

So 申込書に means something like on / in the application form.

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Why is there only one を after 郵便番号 と 新しい 住所?

Because the two nouns are being treated as one combined object list:

• 郵便番号と新しい住所 = postal code and new address
• を記入した = filled in

Japanese often puts one particle after the whole list rather than after each item.

So this structure means:

• [postal code and new address] + を + fill in

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What exactly does と mean here?

Here と means and.

So:

• 郵便番号と新しい住所 = postal code and new address

This is a straightforward noun-to-noun connector.

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What does 記入する mean, and how is it different from just 書く?