تزال

In a sentence

• لا تزال السيارة تعمل بشكل جيد.

  The car is still functioning well.

  Here, 'لا تزال' denotes that the state of the car functioning well persists into the present.

• رغم التغيرات، تزال المبادئ هي النقطة الأساسية.

  Despite the changes, principles remain the key point.

  In this sentence, 'تزال' underlines the continuity of principles even amidst changes.

• إذا زال السبب، زالت النتيجة.

  If the cause disappears, the effect will vanish.

  The word 'زال' here is used in its form to denote the ceasing or vanishing of something (the cause and effect).