فَذَكِّرْ إِنَّمَآ أَنتَ مُذَكِّرٌۭ
Sentence structure
فَذَكِّرْ is an imperative with understood subject أَنْتَ. إِنَّمَآ restricts the statement; أَنتَ is the topic and مُذَكِّرٌ its predicate.
Ayah summary
Continue to remind, for your task is to convey the reminder.
فَذَكِّرْ — So remind
Grammar: فَ resumes; ذَكِّرْ is a second-person masculine-singular Form II imperative with obligatory understood subject أَنْتَ and omitted object.
إِنَّمَآ — only
Grammar: إِنَّ is emphatic and مَا restrains its governance, together forming a restriction particle.
أَنتَ — you
Grammar: A second-person masculine-singular detached pronoun functioning as nominative topic.
مُذَكِّرٌۭ — (are) a reminder
Grammar: An indefinite masculine-singular nominative Form II active participle functioning as predicate.