сам

In a sentence

• Аз сам ходих на разходка вчера.

  I went for a walk alone yesterday.

  In this sentence, 'сам' is an adjective modifying the subject 'аз' (I), meaning 'alone' or 'by oneself', indicating that the action was performed without company.

• Той сам си направи новата къща.

  He built his new house on his own.

  Here, 'сам' emphasizes the subject 'той' (he), meaning that the subject performed the action independently or without assistance.

• Трябва сам да решиш този проблем.

  You need to solve this problem by yourself.

  In this usage, 'сам' precedes the verb 'решиш' (solve), stressing the responsibility to act lies solely with the subject.