لَّيْسَ لَهُمْ طَعَامٌ إِلَّا مِن ضَرِيعٍۢ
Sentence structure
لَّيْسَ is a defective negative verb. لَهُمْ is its fronted predicate and طَعَامٌ its delayed noun; إِلَّا مِن ضَرِيعٍ states the exception.
Ayah summary
They will have no food except the thorny plant called dari‘.
لَّيْسَ — Not is
Grammar: A third-person masculine-singular defective negative verb of the كَانَ class.
لَهُمْ — for them
Grammar: لَ is a preposition and هُمْ a third-person masculine-plural genitive pronoun; the phrase is the fronted predicate of لَيْسَ.
طَعَامٌ — food
Grammar: An indefinite masculine-singular nominative delayed noun of لَيْسَ.
إِلَّا — except
Grammar: An exception particle.
مِن — from
Grammar: A preposition beginning the excepted phrase. This phrase is linked to «طَعَامٌ».
ضَرِيعٍۢ — a bitter thorny plant
Grammar: An indefinite masculine-singular genitive noun governed by مِن.