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One simple test that is often telling is to modify the phrase by right or just. In Standard English, adverb phrases do not accept such modification (e.g., it ran right up the tree [PP]; *it ran right vertically [AdvP].) Also, PPs commonly function as complements in a be VP (e.g., it is in the car), while adverbs cannot normally do so.
Adjectives can be modified by a preceding adverb or adverb phrase, as in very warm, truly imposing, more than a little excited. Some can also be preceded by a noun or quantitative phrase, as in fat-free, two-meter-long. Complements following the adjective may include: prepositional phrases: proud of him, angry at the screen, keen on breeding toads;
The following are single-word prepositions that take clauses as complements. Prepositions marked with an asterisk in this section can only take non-finite clauses as complements. Note that dictionaries and grammars informed by concepts from traditional grammar may categorize these conjunctive prepositions as subordinating conjunctions.
Conversely, prepositions can typically be modified by right (e.g., right up the tree), while adjectives cannot. Finally, preposition phrases readily function as non-predicative adjuncts in clause structure (e.g., after dinner, there was dancing) while AdjPs are typically ungrammatical without a predicand (e.g., *Enjoyable, there was dancing).
For example, "I" may be a pronoun or a Roman numeral; "to" may be a preposition or an infinitive marker; "time" may be a noun or a verb. Also, a single spelling can represent more than one root word .
It ran [right up the tree]. (adverb modifying a prepositional phrase) [Only the dog] was saved. (adverb modifying a noun phrase) In some cases, noun phrases or quantifiers can act as modifiers: [A few more] workers are needed. (quantifier modifying a determiner) She's [two inches taller than her sister]. (noun phrase modifying an adjective)
An adjective phrase (or adjectival phrase) is a phrase whose head is an adjective.Almost any grammar or syntax textbook or dictionary of linguistics terminology defines the adjective phrase in a similar way, e.g. Kesner Bland (1996:499), Crystal (1996:9), Greenbaum (1996:288ff.), Haegeman and Guéron (1999:70f.), Brinton (2000:172f.), Jurafsky and Martin (2000:362).
The remaining part of the phrase is called the prepositional complement, or sometimes the "object" of the preposition. In English and many other Indo-European languages it takes the form of a noun phrase, such as a noun, pronoun, or gerund, possibly with one or more modifiers. A prepositional phrase can function as an adjective or adverb.