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Complete Sentences

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Complete Sentences
CCSS.ELA-LITERACY.L.4.1.E

Basics on the topic Complete Sentences

Do you want to know how to write complete sentences? Learn about complete sentences, run-on sentences, and fragments through our video, worksheets and exercises.

Complete Sentences – Introduction

Have you ever heard someone asking for an answer in a complete sentence? Let’s have a look at the meaning of the term complete sentences.

A sentence is a group of words that make up a complete thought. When we write sentences, we always begin with a capital letter and end with punctuation, such as period, exclamation mark, or question mark.

Complete sentences always have a subject and a predicate. A subject is a person, thing, or place that is performing the action of the sentence. A predicate is an action. It tells us what the subject is or what it is doing.

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Look at one of the complete sentences examples:

A boy saw an unusual animal in the park.

In this sentence, boy is the subject and saw is the predicate. Boy is a person who is performing an action, and saw is the action that the boy did.

Sentence Fragments and Run-on Sentences

Sometimes a sentence is missing important parts, like the subject or the predicate. We call a sentence like this a sentence fragment.

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We can correct sentence fragments by adding the missing information. For example: Is Tom’s favorite subject at school.

This is a sentence fragment because there is not a complete thought. We need to correct it by adding the subject. Now, we have a complete sentence: Math is Tom’s favorite subject at school.

If a sentence has too much information, we call it a run-on sentence.

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We can correct run-on sentences in two different ways. We can either add punctuation to separate the sentence into two or more independent thoughts, or join the thoughts together using a conjunction. Take a look at one of the run-on sentences examples:

Tom also likes English and science he used to dislike art now he enjoys it, too.

This is a run-on sentence because there is more than one complete thought that is not connected properly. The first complete thought is Tom also likes English and Science. We can add a period at the end and turn it into the first complete sentence:

Tom also likes English and Science.

Then, we need to capitalize the “h” in “he”: He used to dislike art now he enjoys it, too. The second complete thought is He used to dislike art. We can connect it to the third complete thought now he enjoys it with the help of a conjunction:

He used to dislike art, but now he enjoys it, too.

These thoughts can remain inside the same sentence, because now they are properly connected.

Complete Sentences – Summary

Let’s repeat what we learned about complete sentences.

A sentence is a group of words that have a complete thought. Complete sentences have both a subject and a predicate. If the sentence is missing a subject or a predicate, we call it a sentence fragment. We correct it by adding the missing information. If the sentence has too much information, we call it a run-on sentence. We correct run-on sentences by adding punctuation or a conjunction.

Type Description
Complete Sentence has a subject and a predicate
Sentence Fragment has either a subject or a predicate; is missing important information
Run-on Sentence has too much information

Now you know how to turn sentence fragments and run-on sentences into complete sentences. For more practice, watch our video and download the complete and run-on sentences' worksheet.

Frequently Asked Questions about Complete Sentences

What is a complete sentence?
How to identify run-on sentences?
What is the difference between complete sentences and fragments?

Transcript Complete Sentences

Complete Sentences "Koko, can you proofread this letter to my Nana?" "Sure, let me look." "This is a very nice letter, but I see you are missing some complete sentences!" A sentence is a word or group of words that have a complete thought. Sentences ALWAYS begin with a capital letter and end with punctuation. A complete sentence MUST have a subject and a predicate. The subject of a sentence is the person, place, or thing that is performing the action of the sentence. In the sentence, 'Pip wrote a letter to his Nana', the subject is Pip. The predicate of a sentence tells what the subject is doing or what the subject is. The predicate of this sentence is ' wrote a letter because it tells what Pip did. If a sentence is missing information, like the subject or a predicate, we call it a sentence fragment. We correct sentence fragments by adding the missing information. If a sentence has too much information, we call it a run-on sentence... and correct it by adding punctuation to separate into two independent thoughts... or join the thoughts together with a conjunction. Let's read through Pip's letter and correct the sentence fragments and run-ons. Dear Nana, It's me, Pip! I hope you are doing well! That I miss you. 'That I miss you ' is not a complete thought, so we need to correct it by adding the missing information. We add the subject to the sentence. Since Pip is writing the letter, the subject would be I and we put it here. The predicate is what Pip wanted to do. He wanted to tell his Nana that he missed her, so we'll add the words I wanted to tell you here. The complete sentence says I wanted to tell you that I miss you! Koko and I are living in a treehouse. Koko is my best friend we go everywhere together have so much fun. This is a run-on sentence because there is more than one complete thought that is not connected properly. The first complete thought is 'Koko is my best friend', so we will put punctuation here. Since a new sentence starts here, we now need to capitalize the in we. We go everywhere together AND have so much fun are also two complete thoughts. These two thoughts CAN remain inside the same sentence because they are joined by the conjunction AND. A talented artist and very smart. What does Pip need to do to make this sentence fragment a complete sentence? He needs to add a subject and predicate. Koko is a talented artist and very smart. She is so funny I want to be just like her! How would you correct this run-on sentence? One way to correct this run-on sentence is to add punctuation and make it two different sentences. She is so funny! I want to be just like her! In the comment section, share one of the other ways you could correct this run-on sentence. Write back, Nana! Love, Pip. While Pip sends off his letter, let's review. A sentence is a word or group of words having a complete thought. Sentences begin with a capital letter and end with punctuation. A complete sentence must have a subject and a predicate. If a sentence is missing information, like the subject or a predicate, we call it a sentence fragment. We correct sentence fragments by adding the missing information. If a sentence has too much information, we call it a run-on sentence and correct it by adding punctuation or a conjunction. "Koko, my Nana wrote me back AND sent me a present!" "What is it, Pip?" "Go try it on!" "Look! I look JUST like you!"

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  1. It so good guys Chex it out pup is the best please like and sub to my channel and please favorite this in the comment so yeah this video really helped me cuase I was having trouble with writing complete sentences but this honestly helped me so much now I am writing full essay so thank you for this video

    From Denique, over 1 year ago

Complete Sentences exercise

Would you like to apply the knowledge you’ve learned? You can review and practice it with the tasks for the video Complete Sentences .
  • What are the parts of a complete sentence?

    Hints

    A sentence is a group of words that have a complete thought.

    Solution

    A complete sentence must begin with a capital letter, end with a punctuation mark, and have a subject and predicate.

  • Change the sentence fragments to complete sentences.

    Hints

    This example shows a sentence fragment. This sentence is missing a predicate.

    This example shows a complete sentence. This sentence has both a subject and a predicate.

    Solution

    A sentence fragment can be corrected to a complete sentence by adding the missing information.

  • Identify the parts of a complete sentence.

    Hints

    The bolded sentence is a complete sentence.

    A complete sentence has both a subject and a predicate.

    • A subject is the person, place, or thing that is performing the action of the sentence.
    • A predicate tells us what the subject is doing or what the subject is.

    The bolded words in the following examples are subjects.

    • Benny goes camping in the mountains.
    • Amy went rollerblading with her grandpa.

    The bolded words in the following examples are predicates.

    • Benny goes camping in the mountains.
    • Amy went rollerblading with her grandpa.

    Solution

    A complete sentence must have a subject and a predicate. A subject is the person, place, or thing that is performing the action of the sentence. A predicate tells us what the subject is doing or what the subject is.

  • Determine if the sentence is fragment or complete.

    Hints

    A complete sentence needs both a subject and a predicate.

    Are any sentences missing a subject?

    Solution

    A complete sentence must have a subject and a predicate. A sentence fragment is a sentence that is missing information, like the subject or predicate.

  • Identify which option is a complete sentence.

    Hints

    Sentences begin with a capital letter and end with punctuation.

    Solution

    A complete sentence must have a subject and a predicate. A subject is the person, place, or thing that is performing the action of the sentence. A predicate tells us what the subject is doing or what the subject is.

  • Identify what each sentence needs in order to be a complete sentence.

    Hints

    A run-on sentence can be corrected by adding a conjunction, such as "and".

    A run-on sentence can be corrected by adding punctuation.

    Solution

    Predicate

    • Sara wants to take her puppy to the dog park.
    Conjunction
    • CeCe wants to plant a garden, so she bought sunflower, tulip, and rose seeds to grow.
    Capital Letter
    • The family was so excited to celebrate together! It was Grandma's 96th birthday!
    Subject
    • Benny is going kayaking. He will need to bring his sunscreen and sunglasses.
    Punctuation
    • They all yelled, "Surprise!" when Grandma walked into the room.