بينما كانت + المضارع
Use بينما كانت + a verb to describe an action that was happening at the same time as another action in the past. It is very useful for storytelling and for background actions. Example: «بينما كانت تمشي، رأت سامية فأراً صغيراً.» This means she was walking when she saw the mouse.
بينما كانت تمشي، رأت سامية فأراً صغيراً.
While she was walking, Samia saw a small mouse.
