1. I saw the boy in the classroom.

2. I saw a boy in the classroom.
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Q1: Is 'in the classroom' an adverb phrase or an adjective phrase?
Are both okay in context?

Q2: Was 'I' in the classroom or out of the classroom? Was 'I' in the classroom or out of the classroom?

Q1: In both sentences, "in the classroom" functions as a prepositional phrase. However, its role in each sentence differs.

In sentence 1, "in the classroom" modifies the verb "saw" and indicates the location where the action took place. It functions as an adverbial phrase because it provides information about where the action occurred.

In sentence 2, "in the classroom" modifies the noun "boy" and provides additional information about which boy is being referred to. It functions as an adjectival phrase because it describes the boy.

Therefore, in sentence 1, "in the classroom" is an adverbial phrase, while in sentence 2, it is an adjectival phrase.

Q2: Based on the information provided, it is unclear whether the word "I" was inside or outside the classroom. The given statements only mention the boy being seen inside the classroom. If there is no other context or information available, it is not possible to determine the location of the word "I" in relation to the classroom.

Q1: In both sentences, "in the classroom" is an adverb phrase because it is modifying the verb "saw." It answers the question "Where?" and provides more information about where the action of seeing took place. Both sentences are grammatically correct and convey slightly different meanings.

In sentence 1, "the boy in the classroom" suggests that there is a specific boy already known to the speaker and that the sighting occurred in the classroom.

In sentence 2, "a boy in the classroom" implies that the speaker saw an unidentified boy in the classroom at that particular moment.

Q2: In both sentences, the pronoun "I" is indicating that the person speaking ("I") was present in the classroom. Both sentences are affirming that "I" was in the classroom.