فَذَكِّرْ إِن نَّفَعَتِ ٱلذِّكْرَىٰ
Sentence structure
فَذَكِّرْ is an imperative with understood subject أَنْتَ and an omitted object. In one conditional reading, إِن introduces the condition, نَّفَعَتِ is its verb, and ٱلذِّكْرَىٰ the subject; the response is understood from the preceding command.
Ayah summary
Continue to remind, for there are people who will benefit from the reminder.
فَذَكِّرْ — So remind
Grammar: فَ resumes or links to the conditional sense; ذَكِّرْ is a second-person masculine-singular Form II imperative with understood subject أَنْتَ and omitted object.
إِن — if
Grammar: In one grammatical reading, a jussive conditional particle introducing the condition.
نَّفَعَتِ — benefits
Grammar: A third-person feminine-singular perfect functioning as the conditional verb in the jussive position. Final ت is the feminine marker, moved with kasrah to avoid two consonants meeting.
ٱلذِّكْرَىٰ — the reminder
Grammar: ٱل is the definite article; ذِّكْرَىٰ is the feminine-singular nominative subject of نَّفَعَتِ, with an estimated ḍammah on the final alif.