Sentence Lab Writing Worksheet
Invention Lab: Sentence Builder
Grade 4 • Subject & Predicate • Correct Punctuation
Name:
Date:
Sentence Formula:
Subject: Who or What
Predicate: Action / Doing
Writing Prompt
You just built a helper robot for school! Write 3–5 complete sentences describing who created it, what incredible job it does, and what funny surprise happened.
1 Guided Starters (Fill in the missing Subject or Predicate)
Complete each sentence frame below
- [Subject] My friend and I invented a robot that
(write predicate: what the robot does)
.
(write subject: who was amazed)
[Predicate] cheered loudly during science class !
- Suddenly,
(subject: the machine)
(predicate: what unexpected action happened)
.
2 Independent Story Draft (Write your 3–5 complete sentences)
Remember: Capital letters • Subjects & Predicates • End marks (. ! ?)
Line 1
Line 2
Line 3
Line 4
Line 5
Line 6
Sentence Detective Self-Check
Subject: Every sentence tells who or what.
Predicate: Every sentence has an action/verb.
Capitals: Sentences begin with capital letters.
End Punctuation: Correct . ! or ? at the end.
Scoring Rubric
Total: ___ / 4
| Criteria | 4 (Mastery) | 3 (Proficient) | 2–1 (Developing) |
|---|
| Sentences | Clear sub & pred | 1 minor fragment | Multiple fragments |
| Punctuation | All correct . ! ? & caps | 1–2 minor errors | Frequent missing marks |
| Details | 3+ clear sentences | 2–3 sentences | Fewer than 2 sentences |
