못하다

In a sentence

• 저는 영어를 잘 못해요.

  I cannot speak English very well.

  Here, '못하다' is used to express inability or lack of skill in performing a specific action, in this case, speaking English fluently.

• 그는 아무것도 못하고 멍하니 있었다.

  He stayed idle without being able to do anything.

  The word '못하다' is used here to indicate inability to take any action or perform tasks under certain circumstances.

• 오늘은 날씨가 나빠서 농구를 못했다.

  Today, I couldn't play basketball because of the bad weather.

  In this sentence, '못하다' conveys the idea of being prevented from doing an activity due to external conditions, not necessarily due to a lack of ability or skills.