يَوْمَئِذٍ تُحَدِّثُ أَخْبَارَهَا ٤
Sentence structure
يَوْمَئِذٍ is a time adverb linked to تُحَدِّثُ. The Form II imperfect has an understood feminine subject referring to the earth; أَخْبَارَهَا is its object.
Ayah summary
On that day, the earth will recount its events.
يَوْمَئِذٍۢ — that Day
Grammar: An accusative time adverb annexed to إِذٍ and linked to تُحَدِّثُ.
تُحَدِّثُ — it will report
Grammar: A Form II third-person feminine-singular imperfect with understood subject.
أَخْبَارَهَا — its news
Grammar: A masculine-plural accusative object; هَا is possessive.