Sentence Builders Worksheet
SENTENCE BUILDERS
Grade 3 Grammar Lab • Complete Sentences & Mechanics
Page 1 of 2
Name:
Date:
Score:
The Sentence Blueprint: Every complete sentence needs 4 parts!
1. Capital Letter Starts with uppercase: The...
2. Subject (Who/What) Who or what does it: The clever fox
3. Predicate (Action) What it does/is: leaped high.
4. End Mark Ends with: . ? or !
Part 1
The Great Sentence Split
4 Points
Draw a slash ( / ) between the complete subject and complete predicate. Circle the subject and underline the predicate. Example: The friendly baker / made warm blueberry muffins.
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The hungry brown bear caught a shiny silver fish in the river.
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Our cheerful librarian read an exciting mystery book aloud.
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Three noisy green parrots flew over the tall palm trees.
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My older brother constructed a wooden birdhouse for the yard.
Part 2
Match & Assemble
3 Points
Write the letter of the matching subject inside the box. Then, write out the complete sentence with a capital letter and a period.
Subjects (Who/What)
A the brave astronaut
B a playful golden retriever
C the speedy yellow racecar
Predicates (Action)
zoomed across the finish line
floated outside the space station
chased the red rubber ball
Part 3
Sentence or Fragment?
3 Points
Put a checkmark (✓) in the correct column. Does the word group have both a subject and predicate?
Word Group
Sentence
Fragment
1. Hopped across the green garden path.
2. The curious little squirrel buried an acorn.
3. That shiny silver bicycle with the loud bell.
SENTENCE BUILDERS
Sentence Repair Shop & Creative Construction
Name:
Page 2 of 2
Part 4
Sentence Repair Shop
3 Points
Rewrite each broken sentence. Add a capital letter at the start and the correct ending punctuation ( . ? or ! ).
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did you see that enormous shooting star streak across the dark sky
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yesterday my grandma baked delicious cinnamon rolls for breakfast
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watch out for that giant flying water balloon
Part 5
Master Builder Challenge
3 Points
Complete each sentence by supplying the missing part. Remember proper capitalization and end marks.
Task A: Supply an action predicate for this subject:
Subject: The mysterious locked wooden chest ...
Task B: Supply a creative subject for this predicate:
Predicate: ... splashed playfully into the deep blue ocean.
Task C: Build your own complete sentence using these sparks: [ robot • secret ]
Builder's Final Quality Inspection
Self-Check before submitting!
Every sentence begins with a capital letter.
Every sentence has a clear subject (who/what).
Every sentence has a clear predicate (action/state).
Every sentence ends with . , ? , or !
Sentence Builders Answer Key
SENTENCE BUILDERS
Answer Key
Grade 3 Grammar Lab • Teacher Evaluation & Grading Guide
Key: Page 1 of 2
Total Worksheet: 20 Total Points
Page 1 Points: 10 Points (4 + 3 + 3)
Focus: Subjects & Predicates
Part 1
The Great Sentence Split (4 Points • 1 pt each)
Slash (/) + Circle Subject + Underline Predicate
The hungry brown bear / caught a shiny silver fish in the river.
Our cheerful librarian / read an exciting mystery book aloud.
Three noisy green parrots / flew over the tall palm trees.
My older brother / constructed a wooden birdhouse for the yard.
Teacher Tip: Watch for students who only circle the noun (e.g. "bear"). Award full credit only when adjectives/modifiers ("The hungry brown bear") are included in the complete subject.
Part 2
Match & Assemble (3 Points)
1 pt for matching • 2 pts for written sentences
Subject Codes:
A: the brave astronaut
B: a playful golden retriever
C: the speedy yellow racecar
Correct Match Letters:
C zoomed across the finish line
A floated outside the space station
B chased the red rubber ball
Sentence 1: The brave astronaut floated outside the space station**.**
Sentence 2: A playful golden retriever chased the red rubber ball**.** (or racecar sentence)
Part 3
Sentence or Fragment? (3 Points • 1 pt each)
Clear Checkmarks
Word Group
Sentence
Fragment
Why?
1. Hopped across the green garden path.
—
No subject
2. The curious little squirrel buried an acorn.
—
Both parts
3. That shiny silver bicycle with the loud bell.
—
No predicate
SENTENCE BUILDERS • ANSWER KEY
Page 2: Repair Shop, Creative Synthesis & Scoring Rubric
Key: Page 2 of 2
Part 4
Sentence Repair Shop (3 Points • 1 pt each)
Check: Capital Letter (0.5 pt) + End Punctuation (0.5 pt)
