Useful is not a noun or a verb, it is an adjective. Adjectives are descriptive words used to describe nouns. For example, if you say, "the useful dog," useful is the adjective modifying dog, the noun.
Jumped is the verb, fox is the noun (quick, brown describe the fox), dog is the direct object (lazy, black describe the dog).
In addition to adjectives, articles also describe nouns. The articles are a, an, and the.A predicate is the verb and the words that relate to that verb. The words that describe the verb are adverbs; adjectives and articles describe nouns that are included in a predicate. Examples:A dog ran past us. (the article 'a' describes the dog as any dog; the adverb 'past' describes where the dog ran)The dog ran fast. (the article 'the' describes the dog as a specific dog; the adverb 'fast' describes how the dog ran)An angry dog barked loudly last night. (the article 'an' describes the dog as any dog; the adjective 'angry' describes the mood of the dog) (the complete predicate is 'barked loudly last night'; the adverb 'loudly' describes how the dog barked; the adjective 'last' describes the noun 'night')Another group of words that describe nouns are pronoun determiners. The pronoun determiners are: Possessive adjectives: my, your, his, her, their, its.Demonstrative pronouns: this, that, these, those.Numeral pronouns: some, any, few, many, none, all.Distributive pronouns:each, either, none, neither.
"Did you see her with her dog?"The first use of 'her' in the sentence is as a personal pronoun as direct object of the verb see.The second use of 'her' in the sentence is as a possessive adjective used to describe the noun 'dog'.It is irrelevant that the possessive adjective 'her' is used to describe the object of the preposition 'dog', the possessive adjective can be used to describe any part of speech where the noun 'dog' would be used (for example, "Her dog is a terrier.", the noun 'dog' is the subject of the sentence).
You can have an adjective and a verb in the same sentence but adjectives go with nouns, they describe nouns egadjective -- bignoun -- dogI saw a big dog. In this sentence the verb is saw.adjective -- interestingnoun -- storyI read an interesting story. In this sentence the verb is read.
"Mute" is another verb that can be used to describe silence.
"The boy chased the dog" is a complete sentence. The verb, chased, is transitive. The object is "dog".
You cannot describe compete because it is a verb and you have to describe a word with a verb.
The word 'barking' is a gerund, the present participle of the verb that functions as a noun. Example:Their dog is driving me crazy with all that barking.The present participle of the verb also functions as an adjective to describe a noun. Example:Don't try to pet a barking dog.
A descriptive verb is a verb that describes some thing.
I describe. She describes.
Adverbs add information to the verb. Adjectives describe nouns.