Adjectives and Prepositions

What Is An Adjective?

An adjective modifies a noun or a pronoun by describing, identifying, or quantifying words. An adjective usually precedes the noun or the pronoun which it modifies.
In the following examples, the highlighted words are adjectives:

The truck-shaped balloon floated over the treetops.

Mrs. Morrison papered her kitchen walls with hideous wall paper.

The small boat foundered on the wine dark sea.

The coal mines are dark and dank.

Many stores have already begun to play irritating Christmas music.

A battered music box sat on the mahogany sideboard.

The back room was filled with large, yellow rain boots.

An adjective can be modified by an adverb, or by a phrase or clause functioning as an adverb. In the sentence

My husband knits intricately patterned mittens.

for example, the adverb "intricately" modifies the adjective "patterned."
Some nouns, many pronouns, and many participle phrases can also act as adjectives. In the sentence

Eleanor listened to the muffled sounds of the radio hidden under her pillow.

for example, both highlighted adjectives are past participles.
Grammarians also consider articles ("the," "a," "an") to be adjectives.

Possessive Adjectives

A possessive adjective ("my," "your," "his," "her," "its," "our," "their") is similar or identical to a possessive pronoun; however, it is used as an adjective and modifies a noun or a noun phrase, as in the following sentences:

I can't complete my assignment because I don't have the textbook.

In this sentence, the possessive adjective "my" modifies "assignment" and the noun phrase "my assignment" functions as an object. Note that the possessive pronoun form "mine" is not used to modify a noun or noun phrase.

What is your phone number.

Here the possessive adjective "your" is used to modify the noun phrase "phone number"; the entire noun phrase "your phone number" is a subject complement. Note that the possessive pronoun form "yours" is not used to modify a noun or a noun phrase.

The bakery sold his favourite type of bread.

In this example, the possessive adjective "his" modifies the noun phrase "favourite type of bread" and the entire noun phrase "his favourite type of bread" is the direct object of the verb "sold."

After many years, she returned to her homeland.

Here the possessive adjective "her" modifies the noun "homeland" and the noun phrase "her homeland" is the object of the preposition "to." Note also that the form "hers" is not used to modify nouns or noun phrases.

We have lost our way in this wood.

In this sentence, the possessive adjective "our" modifies "way" and the noun phrase "our way" is the direct object of the compound verb "have lost". Note that the possessive pronoun form "ours" is not used to modify nouns or noun phrases.

In many fairy tales, children are neglected by their parents.

Here the possessive adjective "their" modifies "parents" and the noun phrase "their parents" is the object of the preposition "by." Note that the possessive pronoun form "theirs" is not used to modify nouns or noun phrases.

The cat chased its ball down the stairs and into the backyard.

In this sentence, the possessive adjective "its" modifies "ball" and the noun phrase "its ball" is the object of the verb "chased." Note that "its" is the possessive adjective and "it's" is a contraction for "it is."

Demonstrative Adjectives

The demonstrative adjectives "this," "these," "that," "those," and "what" are identical to the demonstrative pronouns, but are used as adjectives to modify nouns or noun phrases, as in the following sentences:

When the librarian tripped over that cord, she dropped a pile of books.

In this sentence, the demonstrative adjective "that" modifies the noun "cord" and the noun phrase "that cord" is the object of the preposition "over."

This apartment needs to be fumigated.

Here "this" modifies "apartment" and the noun phrase "this apartment" is the subject of the sentence.

Even though my friend preferred those plates, I bought these.

In the subordinate clause, "those" modifies "plates" and the noun phrase "those plates" is the object of the verb "preferred." In the independent clause, "these" is the direct object of the verb "bought."
Note that the relationship between a demonstrative adjective and a demonstrative pronoun is similar to the relationship between a possessive adjective and a possessive pronoun, or to that between a interrogative adjective and an interrogative pronoun.

Interrogative Adjectives

An interrogative adjective ("which" or "what") is like an interrogative pronoun, except that it modifies a noun or noun phrase rather than standing on its own (see also demonstrative adjectives and possessive adjectives):

Which plants should be watered twice a week?

Like other adjectives, "which" can be used to modify a noun or a noun phrase. In this example, "which" modifies "plants" and the noun phrase "which plants" is the subject of the compound verb "should be watered":

What book are you reading?

In this sentence, "what" modifies "book" and the noun phrase "what book" is the direct object of the compound verb "are reading."

Indefinite Adjectives

An indefinite adjective is similar to an indefinite pronoun, except that it modifies a noun, pronoun, or noun phrase, as in the following sentences:

Many people believe that corporations are under-taxed.

The indefinite adjective "many" modifies the noun "people" and the noun phrase "many people" is the subject of the sentence.

I will send you any mail that arrives after you have moved to Sudbury.

The indefinite adjective "any" modifies the noun "mail" and the noun phrase "any mail" is the direct object of the compound verb "will send."

They found a few goldfish floating belly up in the swan pound.

In this example the indefinite adjective modifies the noun "goldfish" and the noun phrase is the direct object of the verb "found":

The title of Kelly's favourite game is "All dogs go to heaven."

Here the indefinite pronoun "all" modifies "dogs" and the full title is a subject complement.

What is a Preposition?

A preposition links nouns, pronouns and phrases to other words in a sentence. The word or phrase that the preposition introduces is called the object of the preposition.
A preposition usually indicates the temporal, spatial or logical relationship of its object to the rest of the sentence as in the following examples:

The book is on the table.

The book is beneath the table.

The book is leaning against the table.

The book is beside the table.

She held the book over the table.

She read the book during class.

In each of the preceding sentences, a preposition locates the noun "book" in space or in time.
A prepositional phrase is made up of the preposition, its object and any associated adjectives or adverbs. A prepositional phrase can function as a noun, an adjective, or an adverb. The most common prepositions are "about," "above," "across," "after," "against," "along," "among," "around," "at," "before," "behind," "below," "beneath," "beside," "between," "beyond," "but," "by," "despite," "down," "during," "except," "for," "from," "in," "inside," "into," "like," "near," "of," "off," "on," "onto," "out," "outside," "over," "past," "since," "through," "throughout," "till," "to," "toward," "under," "underneath," "until," "up," "upon," "with," "within," and "without."
Each of the highlighted words in the following sentences is a preposition:

The children climbed the mountain without fear.

In this sentence, the preposition "without" introduces the noun "fear." The prepositional phrase "without fear" functions as an adverb describing how the children climbed.

There was rejoicing throughout the land when the government was defeated.

Here, the preposition "throughout" introduces the noun phrase "the land." The prepositional phrase acts as an adverb describing the location of the rejoicing.

The spider crawled slowly along the banister.

The preposition "along" introduces the noun phrase "the banister" and the prepositional phrase "along the banister" acts as an adverb, describing where the spider crawled.

The dog is hiding under the porch because it knows it will be punished for chewing up a new pair of shoes.

Here the preposition "under" introduces the prepositional phrase "under the porch," which acts as an adverb modifying the compound verb "is hiding."

The screenwriter searched for the manuscript he was certain was somewhere in his office.

Similarly in this sentence, the preposition "in" introduces a prepositional phrase "in his office," which acts as an adverb describing the location of the missing papers.