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3rd Grade Build Complete Sentences worksheets

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Build Complete Sentences

Grade 3 Writing Worksheet - Challenge Me

NameDate

Circle the answer, or write your answer on the lines.

  1. Which sentence best joins these two? "It was raining. We played inside."

    • It was raining, so we played inside.
    • It was raining, or we played inside.
    • It was raining we played inside.
    • It was raining, but we played inside.
  2. Which revision fixes this run-on? "The wind blew hard the kite flew high."

    • The wind blew hard, and the kite flew high.
    • The wind blew. Hard the kite flew high.
    • The wind blew hard, the kite flew high.
    • The wind blew hard and, the kite flew high.
  3. Which group of words is NOT a complete sentence?

    • After lunch, Ms. Lee read us a chapter.
    • Run!
    • The students cheered.
    • When the school bell rang at the end of the day.
  4. Which revision fixes the fragment and keeps both ideas? "Before we left for the zoo. We packed snacks."

    • We packed snacks. For the zoo before we left.
    • We left for the zoo. Packed snacks.
    • Before we left for the zoo, we packed snacks.
    • Before we left for the zoo.
  5. Fix this run-on two ways: "The bell rang the class lined up." First write two sentences. Then write one sentence joined with a comma and and, so, or but.

    Two sentences
    One joined sentence
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3rd Grade Build Complete Sentences worksheet 1 – printable PDF
Download PDF: 123456

About this worksheet

A complete sentence needs both a naming part and an action or telling part. Third graders may understand this when speaking, but written fragments still appear when they start with an action and forget who did it. Run-on sentences are the opposite problem: two complete thoughts get pushed together without a stopping point. This worksheet gives students short, checkable decisions about sentence building.

They identify complete sentences, choose predicates, fix fragments, and split or join run-ons. The goal is not grammar labeling for its own sake. It is helping children build sentences that a reader can follow without asking who, what happened, or where one thought ends. The repeated choices build a habit they can use during drafting too.

What your child will learn

  • Choose a complete sentence
  • Combine a subject with a predicate
  • Revise fragments into complete sentences
  • Split run-on sentences into clearer thoughts

Common Core standard: L.3.1

Worked example

'Chased the red ball' is missing who did the action. 'The puppy chased the red ball' is complete.

Common mistake

Thinking a group of words is complete because it is long, even when it is missing a subject or predicate.

Helpful hint

Ask who or what the sentence is about, then ask what happened.

Questions parents ask

What is the most common mistake with build complete sentences?

Thinking a group of words is complete because it is long, even when it is missing a subject or predicate.

How can I help my child with build complete sentences?

Ask who or what the sentence is about, then ask what happened.

Are these 3rd grade writing worksheets free to print?

Yes. All 6 printable versions on this page are free to download and print, with no account needed.

Similar: Build a Focused Paragraph

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