사겠다던

In a sentence

• 그가 사겠다던 책을 아직도 못 샀어요.

  I still haven't bought the book he said he would buy.

  The word '사겠다던' here refers to the mention or commitment of someone ('그가') to buy something ('책') in the past.

• 사겠다던 약속을 왜 지키지 않았나요?

  Why didn't you keep the promise to buy it as you said you would?

  Here, '사겠다던' emphasizes the specific commitment or statement about making a purchase, contrasting it with the subsequent non-fulfillment of that action.

• 민수가 사겠다던 자동차는 너무 비싼 것 같아요.

  It seems that the car Minsoo said he would buy is too expensive.

  In this case, '사겠다던' conveys Minsoo's stated intention or opinion about buying a car.