사전이

In a sentence

• 나는 사전이 필요해요.

  I need a dictionary.

  In this sentence, '사전이' means 'a dictionary,' the subject of the sentence, marked with the subject particle 이.

• 책상 위에 사전이 있습니다.

  There is a dictionary on the desk.

  Here, '사전이' refers to 'a dictionary,' indicating its existence and location, also marked with the subject marker 이.

• 이 사전이 매우 유용해요.

  This dictionary is very useful.

  In this sentence, '사전이' specifies 'this dictionary,' highlighted with the subject particle 이, emphasizing its usefulness.