يَوْمَ تَرْجُفُ ٱلرَّاجِفَةُ
Ayah summary
When the Trumpet is blown the first time, the earth will be violently shaken.
Sentence structure
يَوْمَ is a time adverb. The clause تَرْجُفُ ٱلرَّاجِفَةُ follows it in the genitive position as its annexed clause; تَرْجُفُ is the verb and ٱلرَّاجِفَةُ its explicit subject.
يَوْمَ — on the Day when
Grammar: An accusative adverb of time and مضاف, linked to an understood governing expression.
تَرْجُفُ — will quake
Grammar: A third-person feminine singular imperfect verb in the indicative mood. Its explicit subject follows.
ٱلرَّاجِفَةُ — the great convulsion
Grammar: A definite feminine singular nominative active participle used substantivally and functioning as the subject of تَرْجُفُ.