أَوْ يَذَّكَّرُ فَتَنفَعَهُ ٱلذِّكْرَىٰٓ
Sentence structure
أَوْ coordinates a second possibility. يَذَّكَّرُ is followed by a causal result: the reminder would benefit him.
Ayah summary
Or he might have remembered the reminder and benefited from it.
أَوْ — Or
Grammar: أَوْ is a conjunction.
يَذَّكَّرُ — be reminded
Grammar: form V third-person masculine singular imperfect verb.
فَتَنفَعَهُ — so would benefit him
Grammar: فَ is a causal particle. third-person feminine singular imperfect verb in the subjunctive mood. Attached هُ is a third-person masculine singular pronoun functioning as the object.
ٱلذِّكْرَىٰٓ — the reminder
Grammar: ٱل is the definite article. nominative noun functioning as the subject.