Grade 12 · lesson 2 of 4

Diagnose sentence-boundary editing

Locate finite verbs and independent clauses. Use punctuation or a connector that preserves their logical relationship.

About 22 minutes, plus any extended practice

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Supplied materials

  • Paper and pencil, or a browser text area. All named people/events/records are fictional learning inputs.
  • Worked case: Excerpt A: Only Jo read the note at noon. The intended contrast is Jo versus other possible readers. Excerpt B: Because the room closed. No main clause is supplied. Excerpt C: Jo told Lea that she should explain; both are singular women and she has no clear referent. Excerpt D: Draft: Repeat the test again. Edit: Repeat the test. Repeat already contains the again meaning, so remove the redundant word.
  • Primary check: Excerpt A: Jo only read the note at noon; in this exercise the intended contrast is reading rather than copying or rewriting it. Excerpt B: The room closed, Jo waited. Two independent clauses have only a comma. Excerpt C: The students reads the note; plural students mismatches reads. Excerpt D: Replace The mechanism is a hinge with A hinge is a joint that lets the connected panels turn for readers new to hinge.

Learn the idea

A complete sentence has a main clause. A dependent fragment needs a main clause; independent clauses need a proper join or separation. Repair structure before polishing wording.

Locate finite verbs and independent clauses. Use punctuation or a connector that preserves their logical relationship.

Original worked input: Original excerpt B: Because the room closed. No main clause is supplied. The task is to diagnose sentence-boundary editing. The answer is “fragment missing main clause”. Evidence: Because the room closed. No main clause is supplied. Reasoning: fragment missing main clause is supported because because or although introduces a dependent group with no independent clause. More punctuation does not replace a missing clause.

  1. Read the supplied worked case and identify the part named in this lesson. An adult can model unfamiliar words.
  2. Locate finite verbs and independent clauses. Use punctuation or a connector that preserves their logical relationship.
  3. Check the worked solution: fragment missing main clause. Evidence: Because the room closed. No main clause is supplied. Reasoning: fragment missing main clause is supported because because or although introduces a dependent group with no independent clause. More punctuation does not replace a missing clause.
  4. Use the new primary and practice cases. Give a reason from the actual words before checking the feedback.
Worked example

See the method in action

Original excerpt B: Because the room closed. No main clause is supplied. Solved: fragment missing main clause. Evidence: Because the room closed. No main clause is supplied. Reasoning: fragment missing main clause is supported because because or although introduces a dependent group with no independent clause. More punctuation does not replace a missing clause. Locate finite verbs and independent clauses. Use punctuation or a connector that preserves their logical relationship.

Your turn

Check your reasoning

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Helpful tips
  • Because the gate closed needs a main clause.
  • More punctuation does not replace a missing clause.
Original excerpt B: The room closed, Jo waited. Two independent clauses have only a comma. Use excerpt B only. Which boundary condition is supplied?

Feedback appears here after you check. This is practice, not a graded school assessment.

See the answer and explanation

comma splice

Evidence: The room closed, Jo waited. Two independent clauses have only a comma. Reasoning: comma splice is supported because two independent clauses are joined by a comma alone. More punctuation does not replace a missing clause.

Take it further

Changed-input task: Original excerpt B: The hinge tore Lea stopped. No conjunction or sentence boundary joins the clauses. Give an evidence-based answer before looking at the model. Expected reasoning: Evidence: The hinge tore Lea stopped. No conjunction or sentence boundary joins the clauses. Reasoning: run-on with no boundary is supported because two complete clauses run together without punctuation or a conjunction. More punctuation does not replace a missing clause. Then write a brief alternative sentence, paragraph, source note or scene that demonstrates the same operation; label new fictional details and preserve source limits.

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More practice: try new cases

Choose an answer for each problem. Explain your method on paper, then use the feedback to decide what to revisit.

More practice: try new cases
1. Original excerpt B: The room closed Jo waited. Two independent clauses have no boundary. Use excerpt B only. Which boundary condition is supplied?
Need a hint?
  • Because the gate closed needs a main clause.
  • More punctuation does not replace a missing clause.
2. Original excerpt B: The room closed, and Jo waited. Use excerpt B only. Which boundary condition is supplied?
Need a hint?
  • Because the gate closed needs a main clause.
  • More punctuation does not replace a missing clause.
3. Original excerpt B: Although the hinge tore. No independent clause completes the concession. Use excerpt B only. Which boundary condition is supplied?
Need a hint?
  • Because the gate closed needs a main clause.
  • More punctuation does not replace a missing clause.

Your choices are temporary. Feedback appears after you check all the answers.

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