What is a Sentence? Structure, Types and Examples

Team FEG

What is a Sentence

A sentence is the basic unit of communication in any language. It is a group of words that expresses a complete thought and has a subject and a predicate. But what makes a sentence complete, and how can we vary the structure and types of sentences to make our writing more effective and engaging? In this article, we will explore the definition, structure, types, and examples of sentences, and provide some tips to help you improve your sentence writing skills.

What is a Sentence?

A sentence is a group of words that expresses a complete idea or statement.  A sentence starts with a capital letter and ends with a punctuation mark, like a period, question mark, or exclamation point. It typically includes a subject and a predicate. The subject is what the sentence is about, and the predicate tells us what the subject is doing or the information about the subject. Together, they form the essential elements that give structure to our words. Here’s an example:  The sun (subject) shines brightly (predicate).

A sentence is not just a random collection of words; it’s a complete thought. It provides information, poses a question, gives a command, or expresses an emotion. This completeness is important for effective communication, ensuring that the receiver of the message grasps the intended meaning without any confusion. Consider this: She loves to read books. This sentence provides a complete thought, expressing someone’s affection for reading books.

Components of a Sentence

Understanding the inner workings of a sentence involves identifying its key components. Each part plays a crucial role in shaping the overall structure and meaning. Below are the main components of a sentence:

  • Subject: The subject is the main noun or pronoun in a sentence that performs the action or is the focus of the sentence.  The subject of a sentence tells us about who or what the sentence is talking about. Example: The cat is sleeping.
  • Predicate: The predicate is the part of the sentence that contains the verb and provides information about the subject. It tells us what the subject is doing or what is happening to it. Example: The cat is sleeping.
  • Verb: The verb is a key element in the predicate and expresses the action or state of being of the subject. Example: The cat is sleeping.
  • Object: An object is a noun or pronoun that receives the action of the verb. Not all sentences have objects, but when they do, they add more detail to the action. Example: The cat is sleeping on the bed.
  • Complement: A complement is a word or group of words that completes the meaning of a sentence A complement has two types: subject complement and object complement.
    • Subject complement: Renames or describes the subject. Example: She is a doctor.
    • Object complement: Renames or describes the object. Example: They painted the door green.
  • Modifiers: Modifiers are words or phrases that provide additional information about other elements in the sentence. They can include adjectives (modify nouns), adverbs (modify verbs, adjectives, or other adverbs), and phrases/clauses that function as modifiers. Example: The happy dog (adjective modifying the noun “dog”). She runs quickly (adverb modifying the verb “runs”).
  • Conjunctions: Conjunctions are words that connect words, phrases, or clauses within a sentence. Example: I like both coffee and tea (conjunction “and” connecting two nouns).
  • Punctuation: Punctuation marks, such as periods, commas, question marks, and exclamation points, are used to structure and clarify the meaning of sentences. Example: Please close the door. (Period indicating the end of the sentence)

Sentence Structures

In English grammar, there are four key sentence structures:

  • Simple Sentences
  • Compound Sentences
  • Complex Sentences
  • Compound-Complex Sentences

Simple Sentences

A simple sentence is the most basic form of sentence structure, consisting of one independent clause. An independent clause contains a subject and a predicate, forming a complete and standalone thought. It can function as a complete sentence on its own.


  • The cat sleeps peacefully.
  • He enjoys playing the guitar.
  • The sun sets behind the mountains.

Compound Sentences

A compound sentence combines two or more independent clauses using coordinating conjunctions (such as and, but, or) or punctuation like semicolons. This allows for a more complex and connected expression of ideas.


  • She loves to dance, but her sister prefers to sing.
  • I enjoy reading; my sister prefers painting.
  • The weather was cold, so they decided to stay indoors.

Complex Sentences

A complex sentence structure contains an independent clause and one or more dependent clauses. Dependent clauses cannot stand alone as complete thoughts and rely on the independent clause for context and meaning.


  • Although it was raining, my dad went for a walk.
  • Since he had studied hard, he passed the exam.
  • After the movie ended, they went for dinner.

Compound-Complex Sentences

Compound-complex sentence structure combines elements of both compound and complex sentences. It includes two or more independent clauses and at least one dependent clause.


  • She went to the store, and he stayed at home because he was feeling unwell.
  • Although it was raining, they decided to go for a hike, and they enjoyed the adventure.
  • He studied diligently, so he aced the exam, but he still felt anxious about the results.

Types of Sentences

There are four main types of sentences and each serves a different purpose in our language.

  • Declarative Sentences
  • Interrogative Sentences
  • Imperative Sentences
  • Exclamatory Sentences

Declarative Sentences

A declarative sentence is the most common type of sentence and aims to convey information, provide facts, or express opinions.


  • The sky is blue.
  • She enjoys reading books.
  • I like ice cream.

Interrogative Sentences

An interrogative sentence seeks information by posing a question. It often begins with words like do, did, who, what, where, when, why, or how.


  • Where is the nearest library?
  • Did you finish your homework?
  • How does this machine work?

Imperative Sentences

An imperative sentence gives a command, makes a request, or offers guidance. It’s a direct way to convey instructions.


  • Please pass the salt.
  • Finish your chores before dinner.
  • Close the door behind you.

Exclamatory Sentences

An exclamatory sentence conveys strong emotion or surprise and it usually ends with an exclamation mark.


  • What a beautiful sunset!
  • I can’t believe we won!
  • How amazing that performance was!

Sentence Construction Tips

Constructing effective sentences is not just about following grammatical rules; it’s an art that contributes significantly to clear and impactful communication. Here are some valuable tips with examples to enhance your sentence construction skills:

  1. Use proper punctuation: Proper punctuation is essential for clear and concise sentence construction. For example, use a period at the end of a declarative sentence, a question mark at the end of an interrogative sentence, and an exclamation mark at the end of an exclamatory sentence.
  2. Vary sentence structure: Varying sentence structure keeps your writing alive and readers interested. Use a combination of simple, compound, complex, and compound-complex sentences to add variety to your writing.
  3. Use active voice: Active voice makes your writing more direct and engaging. For example, “The cat chased the mouse” (active) instead of “The mouse was chased by the cat” (passive).
  4. Use parallel structure: Parallel structure means using the same grammatical form to express similar ideas. For example, “I like to run, swim, and bike” instead of “I like to run, swimming, and biking.”
  5. Avoid run-on sentences: Run-on sentences are two or more independent clauses that are not properly connected. For example, “I wanted to play outside it was raining” instead of “I wanted to play outside, but it was raining.” Use a coordinating conjunction, a semicolon, or a period to connect the independent clauses.

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