What Makes a Complete Sentence?

Lesson Details

Grade Level
K-2
Duration (minutes)
1
Summary
A K-2 language arts lesson teaching students how to identify a complete sentence versus a fragment using the "who or what does what?" check.

Complete sentences vs. fragments — complete sentences like 'The dog runs' and 'I jump' have a who and a does-what, while fragments like 'In the park' and 'Running fast' are missing the who or what

Student Worksheet: What Makes a Complete Sentence?

Teacher Note: Students can watch the video lesson above and answer the questions. Click the “Teacher Answer Key” dropdown below when you are ready to review the solutions!

Key Concepts:

• Complete Sentence: A complete thought that tells who or what, and what happens.

• Fragment: An unfinished thought that is missing the who or what.

• The Check: Ask “who or what… does what?” to test if a sentence is complete.

Instructions: Read each question carefully and write your answer in the space provided.

  1. Question 1: What two questions can you ask to check if a sentence is complete?
  2. Question 2: In the sentence “The dog runs,” who is the sentence about?
  3. Question 3: In the sentence “The dog runs,” what does the dog do?
  4. Question 4: Is “Running fast” a complete sentence? Why or why not?
  5. Question 5: Is “I jump” a complete sentence, even though it’s short? Why?
Click to reveal Teacher Answer Key

1. Who or what? and Does what?

2. The dog

3. Runs

4. No, because it is missing the who — we don’t know who is running

5. Yes, because it has a who (I) and a does what (jump), even though it’s short

Disclaimer: This worksheet was generated with AI assistance based on original video content. It is intended for educational reference only. Teachers are encouraged to review and adjust questions to fit their curriculum standards before classroom use.

🎯 Extension Activity: Read students a mix of complete sentences and fragments out loud (like "The bird flies" and "Under the table"). Have them give a thumbs up for a complete sentence and a thumbs down for a fragment.

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