singur

In a sentence

• Sunt singur acasă.

  I am alone at home.

  Here, 'singur' is used to indicate being alone, without company.

• Am făcut proiectul singur.

  I did the project by myself.

  In this context, 'singur' signifies performing an action individually, without help from others.

• Acesta este singurul răspuns corect.

  This is the only correct answer.

  Here, 'singurul' (the masculine singular definite articulation of 'singur') means 'the only', describing uniqueness.