Form the passive with be in the required tense and a past participle. Use it when the action or recipient matters more than the agent; add by when the agent is relevant.
Practical examples
The report was published yesterday.
نُشر التقرير أمس.
Your request is being reviewed.
يُراجع طلبك حاليًا.
The bridge was designed by a local engineer.
صمم الجسر مهندس محلي.