That�s a very good question and a common point of confusion.

While you are correct that "from inside" is a prepositional phrase, the part of speech of "inside" in this sentence is an adverb.

Here is a breakdown of why:

1. "Inside" as an Adverb: In this sentence, "inside" is telling us where he came from. It modifies the verb "came," which is the function of an adverb.

2. The Role of the Preposition: The preposition "from" is followed by the adverb "inside." It is common for prepositions to be followed by adverbs of place (like inside, outside, downstairs, here, there) to form an adverbial phrase.

Consider these examples to see the difference:

• Adverb: He ran inside. (tells where he ran)

• Adverb: The dog is inside. (tells where the dog is)

• Noun: The inside of the house was cold. (refers to a place, a "thing")

• Adjective: We took the inside route. (describes the route)

So, in the sentence "He came from inside," "inside" is an adverb, and the entire phrase "from inside" acts as an adverbial phrase of place.

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