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What is a Verb?

The verb is perhaps the most important part of the sentence. A verbor compound verb asserts something about the subject of the sentence and express actions, events, or states of being. The verb or compound verb is the critical element of the predicate of a sentence.

In each of the following sentences, the verb or compound verb ishighlighted:

Dracula bites his victims on the neck.

The verb "bites" describes the action Dracula takes.

In early October, Giselle will plant twenty tulip bulbs.

Here the compound verb "will plant" describes an action that will take place in the future.

My first teacher was Miss Crawford, but I remember the janitor Mr. Weatherbee more vividly.

In this sentence, the verb "was" (the simple past tense of "is") identifies a particular person and the verb "remember" describes a mental action.

Karl Creelman bicycled around the world in 1899, but his diaries and his bicycle were destroyed.

In this sentence, the compound verb "were destroyed" describes an action which took place in the past.

What is an Adverb?

An adverb can modify a verb, an adjective, another adverb, a phrase, or a clause. An adverb indicates manner, time, place, cause, or degree and answers questions such as "how," "when," "where," "how much".
While some adverbs can be identified by their characteristic "ly" suffix, most of them must be identified by untangling the grammatical relationships within the sentence or clause as a whole. Unlike an adjective, an adverb can be found in various places within the sentence.
In the following examples, each of the highlighted words is an adverb:

The seamstress quickly made the mourning clothes.

In this sentence, the adverb "quickly" modifies the verb "made" and indicates in what manner (or how fast) the clothing was constructed.

The midwives waited patiently through a long labour.

Similarly in this sentence, the adverb "patiently" modifies the verb "waited" and describes the manner in which the midwives waited.

The boldly spoken words would return to haunt the rebel.

In this sentence the adverb "boldly" modifies the adjective "spoken."

We urged him to dial the number more expeditiously.

Here the adverb "more" modifies the adverb "expeditiously."

Unfortunately, the bank closed at three today.

In this example, the adverb "unfortunately" modifies the entire sentence.

What is a Noun?

A noun is a word used to name a person, animal, place, thing, and abstract idea. Nouns are usually the first words which small children learn. The highlighted words in the following sentences are all nouns:

Late last year our neighbours bought a goat.

Portia White was an opera singer.

The bus inspector looked at all the passengers' passes.

According to Plutarch, the library at Alexandria was destroyed in 48 B.C.

Philosophy is of little comfort to the starving.

A noun can function in a sentence as a subject, a direct object, anindirect object, a subject complement, an object complement, anappositive, an adjective or an adverb. 

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 Christmasmusic.

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 clausefunctioning 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 hiddenunder her pillow.

for example, both highlighted adjectives are past participles.

Grammarians also consider articles ("the," "a," "an") to be adjectives.

What is a Pronoun?

A pronoun can replace a noun or another pronoun. You use pronouns like "he," "which," "none," and "you" to make your sentences less cumbersome and less repetitive.
Grammarians classify pronouns into several types, including the personal pronoun, the demonstrative pronoun, the interrogative pronoun, the indefinite pronoun, the relative pronoun, the reflexive pronoun, and the intensive pronoun.

What is a Preposition?

A preposition links nouns, pronouns and phrases to other words in asentence. 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.

What is a Conjunction?

You can use a conjunction to link words, phrases, and clauses, as in the following example:

I ate the pizza and the pasta.

Call the movers when you are ready.

Co-ordinating Conjunctions

You use a co-ordinating conjunction ("and," "but," "or," "nor," "for," "so," or "yet") to join individual words, phrases, and independent clauses. Note that you can also use the conjunctions "but" and "for" as prepositions.
In the following sentences, each of the highlighted words is a co-ordinating conjunction:

Lilacs and violets are usually purple.

In this example, the co-ordinating conjunction "and" links two nouns.

This movie is particularly interesting to feminist film theorists,for the screenplay was written by Mae West.

In this example, the co-ordinating conjunction "for" is used to link two independent clauses.

Daniel's uncle claimed that he spent most of his youth dancing on rooftops and swallowing goldfish.

Here the co-ordinating conjunction "and" links two participle phrases("dancing on rooftops" and "swallowing goldfish") which act as adverbsdescribing the verb "spends."

Subordinating Conjunctions

A subordinating conjunction introduces a dependent clause and indicates the nature of the relationship among the independent clause(s) and the dependent clause(s).
The most common subordinating conjunctions are "after," "although," "as," "because," "before," "how," "if," "once," "since," "than," "that," "though," "till," "until," "when," "where," "whether," and "while."
Each of the highlighted words in the following sentences is a subordinating conjunction:

After she had learned to drive, Alice felt more independent.

The subordinating conjunction "after" introduces the dependent clause "After she had learned to drive."

If the paperwork arrives on time, your cheque will be mailed on Tuesday.

Similarly, the subordinating conjunction "if" introduces the dependent clause "If the paperwork arrives on time."

Gerald had to begin his thesis over again when his computer crashed.

The subordinating conjunction "when" introduces the dependent clause "when his computer crashed."

Midwifery advocates argue that home births are safer becausethe mother and baby are exposed to fewer people and fewer germs.

In this sentence, the dependent clause "because the mother and baby are exposed to fewer people and fewer germs" is introduced by the subordinating conjunction "because."

Correlative Conjunctions

Correlative conjunctions always appear in pairs -- you use them to link equivalent sentence elements. The most common correlative conjunctions are "both...and," "either...or," "neither...nor,", "not only...but also," "so...as," and "whether...or." (Technically correlative conjunctions consist simply of a co-ordinating conjunction linked to anadjective or adverb.)
The highlighted words in the following sentences are correlative conjunctions:

Both my grandfather and my father worked in the steel plant.

In this sentence, the correlative conjunction "both...and" is used to link the two noun phrases that act as the compound subject of the sentence: "my grandfather" and "my father".

Bring either a Jello salad or a potato scallop.

Here the correlative conjunction "either...or" links two noun phrases: "a Jello salad" and "a potato scallop."

Corinne is trying to decide whether to go to medical school orto go to law school.

Similarly, the correlative conjunction "whether ... or" links the twoinfinitive phrases "to go to medical school" and "to go to law school."

The explosion destroyed not only the school but also the neighbouring pub.

In this example the correlative conjunction "not only ... but also" links the two noun phrases ("the school" and "neighbouring pub") which act as direct objects.
Note: some words which appear as conjunctions can also appear as prepositions or as adverbs.

What is an Interjection?

An interjection is a word added to a sentence to convey emotion. It is not grammatically related to any other part of the sentence.
You usually follow an interjection with an exclamation mark. Interjections are uncommon in formal academic prose, except in direct quotations.
The highlighted words in the following sentences are interjections:

Ouch, that hurt!

Oh no, I forgot that the exam was today.

Hey! Put that down!

I heard one guy say to another guy, "He has a new car, eh?"

I don't know about you but, good lord, I think taxes are too high!