لِّنُخْرِجَ بِهِۦ حَبًّا وَنَبَاتًا
Sentence structure
The purpose clause explains why the water was sent down. لِّنُخْرِجَ expresses purpose, بِهِۦ is linked to the verb, حَبًّا is its object, and وَنَبَاتًا is coordinated with that object.
لِّنُخْرِجَ — so that We bring forth
Grammar: لِ is the lām of purpose. نُخْرِجَ is a form IV, first-person plural imperfect verb in the subjunctive mood, with understood subject نَحْنُ.
بِهِۦ — by means of it
Grammar: بِ is a preposition and attached هِۦ a third-person masculine singular pronoun in the genitive position, referring to the water. The phrase is linked to نُخْرِجَ.
حَبًّۭا — grain
Grammar: An indefinite masculine accusative noun and the object of نُخْرِجَ.
وَنَبَاتًۭا — and vegetation
Grammar: وَ is a conjunction. نَبَاتًا is an indefinite accusative noun coordinated with حَبًّا.