The word 'his' is not a noun, it is a personal pronoun; a word that takes the place of a noun for a male person. For Example:
Eric will pick us up, he will be here at six. (the pronoun 'he' takes the place of the noun 'Eric' in the second part of the sentence)
She (pron.) went (verb) to (prep.) the store (noun) and (conj.) found (verb) the eggs (noun) she needed on (prep.) the shelf (noun). I ate around Earth but hiccuped enchiladas toward nebulas.
A prepositional phrase is a group of words that begins with a preposition and usually ends with a noun or pronoun. It functions as an adjective or adverb to provide more information about a noun or verb in a sentence.
Generally, a preposition is followed by a noun phrase and a conjunction is followed by a clause. -You should do it before your arrival. PREP + NP -You should do it before you arrive. CONJ + CLAUSE A preposition, however, can also be followed by a pronoun, gerund, noun clause or a relative clause, at least in formal English. -You should do it before him. PREP + PRON -You should do it before going. PREP + GER -You should think about what she said. PREP + NOUN CLAUSE -This is the house in which they live. PREP + RELATIVE CLAUSE
Here is technically a noun because here describes a place. Remember, a noun is a person, place, or thing.
Preposition (PREP) PowerPC Reference Platform (PReP)
Capital Prep is a high school in Hartford, Connecticut. Capital Prep girls refers to the girls' sports teams at Capital Prep.
KOH Prep and wet prep are both tests in microbiology. The KOH prep tests for fungal elements and yeast. The wet prep tests for yeast, tricomonas (a sexually transmitted parasite), and clue cells (which indicate the presence of a bacterial infection).
Public Prep was created in 2005.
Tower Prep was created in 2010.
Revolution Prep was created in 2002.
Hamilton Prep was created in 2007.
University Prep was created in 1976.