통장을

In a sentence

• 통장을 잃어버렸어요.

  I lost the bankbook.

  In this sentence, '통장을' is the object of the verb '잃어버렸어요' (lost), indicating the bankbook as the item that was lost.

• 통장을 열다.

  I open a bank account.

  Here, '통장을' is the object of the verb '열다' (to open), suggesting the action of opening a new bank account as represented by the bankbook.

• 통장을 확인하고 싶어요.

  I want to check the bankbook.

  Here, '통장을' is the object of the verb '확인하고 싶어요' (want to check), reflecting the idea of reviewing or verifying the details recorded in the bankbook.