اِقْرَأْ فَتَفْهَمَ الدَّرْسَ.
Read so that you understand. Iqraʾ is imperative, fāʾ introduces consequence, tafhama is subjunctive by implied an, and al-darsa is an object.
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Full Parsing: Result Fāʾ
The Subjunctive Imperfect and Its Governors
اِقْرَأْ فَتَفْهَمَ الدَّرْسَ.
Read so that you understand. Iqraʾ is imperative, fāʾ introduces consequence, tafhama is subjunctive by implied an, and al-darsa is an object.