I appreciate your help.

1. We are going to hold a farewell party for him.

2. We are going to hold the farewell party for him.

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The difference between the two sentence is the article. The prepositional phrase can be an adverb phrase and an adjective phrase. In each sentence, is 'for him' an adjective phrase. Can't 'for him' in #1 be an adverb phrase?

#1 makes sense to me. So, yes. Is this a test question or something?

What about #2?

Do you mean #1 can be either an adverb phrase or an adjective phrase?

Great question! In both sentences, the phrase "for him" is used to indicate the recipient or the person for whom the farewell party is being organized.

In Sentence 1, "We are going to hold a farewell party for him," the indefinite article "a" is used before "farewell party." This indicates that it is just one of the many possible farewell parties that could be held for him. Here, the phrase "for him" is functioning as an adjective phrase modifying the noun "farewell party," by specifying who the party is for.

In Sentence 2, "We are going to hold the farewell party for him," the definite article "the" is used before "farewell party." This implies that there is a specific farewell party being referred to, possibly one that has been previously mentioned or is well-known among the speakers. Again, the phrase "for him" is acting as an adjective phrase modifying the noun "farewell party," indicating who the party is for.

To answer your question about whether "for him" in Sentence 1 could be an adverb phrase, it's important to understand the function of adverb phrases. Adverb phrases provide additional information about verbs, adjectives, or other adverbs, typically answering questions like "how," "when," "where," "why," or "to what extent." In Sentence 1, the phrase "for him" is not directly modifying the verb "hold" or providing any specific information about how, when, where, or why the farewell party is being held. Instead, it is more closely associated with the noun "farewell party" as a descriptor of who the party is for. Therefore, in this context, "for him" functions as an adjective phrase rather than an adverb phrase.

So, in both sentences, "for him" acts as an adjective phrase modifying the noun phrase "farewell party," specifying the recipient of the party.