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https://www.tuitionclub.org/2019/02/05/students-learn-the-particles-%d8%a3%d9%8e%d9%86%d9%8e%d9%91-%d8%a5%d9%90%d9%86%d9%8e%d9%91-and-%d8%a3%d9%8e%d9%86%d9%92-in-arabic/
Students Learn The Particles أَنَّ , إِنَّ and أَنْ in Arabic!