Adjectival and adverbial phrases are types of prepositional phrases. They contain a preposition, an object, and any modifiers.  An adjectival phrase describes or modifies a noun. An adverbial phrase modifies a verb.  An adjectival phrase begins with a preposition, acts as an adjective, and answers the question "which one". An adverbial phrase begins with a preposition, acts as an adverb, and answers the question "how, when, where, or why".  Adverbials may not always be mobile. If you can shift a phrase or clause in a sentence, it's most likely an adverbial.  Examples of adjectival... Show more

Adjectival and adverbial phrases are types of prepositional phrases. They contain a preposition, an object, and any modifiers. 

An adjectival phrase describes or modifies a noun. An adverbial phrase modifies a verb. 

An adjectival phrase begins with a preposition, acts as an adjective, and answers the question "which one". An adverbial phrase begins with a preposition, acts as an adverb, and answers the question "how, when, where, or why". 
Adverbials may not always be mobile. If you can shift a phrase or clause in a sentence, it's most likely an adverbial. 

Examples of adjectival phrases:
"I watched the man in the brown coat"
"The tree near the house was a wattle"
"He was a man of few words" 

Examples of adverbial phrases:
"On Saturday night, we went to a jazz concert"
"This afternoon, I went to Subway to eat Spicy Italian sandwich for lunch" 

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