причина

In a sentence

• Основната причина за закъснението ми беше натовареният трафик.

  The main reason for my delay was the heavy traffic.

  In this sentence, 'причина' is used to denote the cause or reason behind the event of being late. It is treated as an abstract noun describing a specific factor.

• Има причина, поради която не дойдох на срещата.

  There is a reason why I didn't come to the meeting.

  Here, 'причина' refers to a valid justification or underlying factor explaining why the person could not attend the meeting.

• Твоята усмивка е причината за моето щастие.

  Your smile is the reason for my happiness.

  In this statement, 'причина' is metaphorically associated with something positive, the source of joy for the speaker.