الزمن

In a sentence

• الزمن يمضي بسرعة.

  Time passes quickly.

  Here, الزمن refers to time in the general sense of its ongoing passage.

• علينا الاستفادة من الزمن المتاح.

  We need to make use of the available time.

  In this sentence, الزمن refers to a specific amount or instance of available time.

• الزمن الماضي يحمل ذكريات جميلة.

  The past time holds beautiful memories.

  Here, الزمن is used to describe a specific period in the past.