銀行 and 郵便局: locations and errands
Read the location, order, and completion of errands involving banks and post offices.
An action at a bank
銀行, read ぎんこう, means bank. 銀行で口座を作りました。 means opening an account at a bank.
銀行に行く予定です。 states a plan to go to a bank. It does not report that the visit or errand is already complete.
An action at a post office
郵便局, read ゆうびんきょく, means post office. 郵便局で切手を買いました。 means buying stamps at a post office.
郵便局に荷物を持っていきました。 means taking a parcel or other belongings to a post office. Taking an item there is separate from completing its acceptance for mailing.
Order of visits
銀行に寄ってから、郵便局へ行きました。 says that someone stopped at the bank before going to the post office. てから establishes the order.
銀行も郵便局も閉まっていました。 says that both the bank and the post office were closed. It gives neither their regular hours nor their days off.
Does 郵便局に荷物を持っていきました establish that mailing was completed?
Show the answer and why
No. It reports only taking the item to the post office.