سبب

In a sentence

• كان السبب في تأخره زحمة المرور.

  The reason for his delay was the traffic.

  Here, 'سبب' (reason) is used as a noun indicating causality.

• ما هو سبب سعادتك اليوم؟

  What is the reason for your happiness today?

  In this sentence, 'سبب' is a noun used to inquire about the cause of a specific state (happiness).

• قرر أن يسأل عن سبب المشكلة لحلها.

  He decided to ask about the cause of the problem to solve it.

  Here, 'سبب' appears as a noun denoting the origin or cause of an issue.