3.3 Sentence Construction & Punctuation

Sentence Construction & Punctuation

Technical Sentence Construction in Incident Reports

Writing clear, concise, and grammatically complete sentences is vital for producing professional emergency service narratives. Complex incident scenes involve multiple actions occurring simultaneously, making it easy for writers to produce confusing run-on sentences or incomplete sentence fragments.

On the NFSI exam, sentence structure questions evaluate a candidate's ability to identify structural errors, select proper punctuation, and combine separate observations into coherent, professional paragraphs.

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|                   COMMON SENTENCE STRUCTURE ERRORS                    |
+-----------------------------------------------------------------------+
|  FRAGMENT:     Missing subject, verb, or complete thought.            |
|  COMMA SPLICE: Two sentences joined with only a comma.                |
|  RUN-ON:       Two sentences joined with no punctuation.              |
|  NON-PARALLEL: Inconsistent verb forms in a list of actions.          |
+-----------------------------------------------------------------------+

1. Sentence Fragments

A sentence fragment is an incomplete thought punctuated as if it were a complete sentence. Fragments usually lack a subject, lack a verb, or consist of a dependent (subordinate) clause left standing alone.

• Fragment (Missing Verb): The thermal imaging camera on the front seat of Engine 3.
• Corrected: The thermal imaging camera was placed on the front seat of Engine 3.
• Fragment (Dependent Clause): Because smoke was heavily charging the second-floor hallway.
• Corrected: Because smoke was heavily charging the second-floor hallway, firefighters initiated hydraulic ventilation. (OR: Firefighters initiated hydraulic ventilation because smoke was heavily charging the second-floor hallway.)

2. Run-On Sentences and Comma Splices

A run-on sentence occurs when two or more independent clauses (complete thoughts) are joined without appropriate punctuation or coordinating conjunctions. A comma splice is a specific type of run-on where two independent clauses are incorrectly linked with only a comma.

• Comma Splice (Incorrect): Engine 1 laid 500 feet of supply line, Ladder 2 positioned on Side Alpha.
• Run-On (Incorrect): Engine 1 laid 500 feet of supply line Ladder 2 positioned on Side Alpha.

Three Methods to Correct Comma Splices and Run-On Sentences

1. Separate into two distinct sentences: Use a period and capitalize the next word.
   • Example: Engine 1 laid 500 feet of supply line**.** Ladder 2 positioned on Side Alpha.
2. Use a semicolon: Ideal when the two independent clauses are closely related in thought.
   • Example: Engine 1 laid 500 feet of supply line**;** Ladder 2 positioned on Side Alpha.
3. Use a comma and a coordinating conjunction (FANBOYS: For, And, Nor, But, Or, Yet, So):
   • Example: Engine 1 laid 500 feet of supply line**, and** Ladder 2 positioned on Side Alpha.

3. Parallel Structure (Parallelism)

Parallelism means using the same grammatical pattern to express two or more ideas of equal importance. In incident narratives, parallel structure is essential when listing sequential operational steps or equipment deployments.

• Non-Parallel (Incorrect): The crew was responsible for forcing entry, to conduct a primary search, and ventilation of the roof. (Mixes gerund forcing, infinitive to conduct, and noun ventilation).
• Parallel (Correct): The crew was responsible for forcing entry, conducting a primary search, and ventilating the roof. (Uses consistent -ing gerund verbs).
• Parallel (Correct Past Tense): The crew forced entry, conducted a primary search, and ventilated the roof.

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Punctuation Rules for Fire Service Documentation

1. Comma Mechanics in Narrative Writing

• Introductory Clauses: Place a comma after an introductory dependent clause or prepositional phrase of four or more words.
  • Example: After completing the primary search**,** Captain Jones reported clear conditions to Command.
• Series and the Oxford Comma: Use commas to separate three or more words, phrases, or clauses in a series. Include the serial (Oxford) comma before the final conjunction to prevent ambiguity.
  • Example: The apparatus carried a portable generator**,** hydraulic cutters**,** and three spare SCBA cylinders.
• Compound Sentences: Place a comma before a coordinating conjunction when joining two independent clauses.
  • Example: Firefighters stretched an attack line to the front door**,** but heavy fire blocked access to the stairs.

2. Semicolons and Colons

• Semicolons: Use a semicolon between independent clauses not joined by a coordinating conjunction, or to separate items in a series that already contain internal commas.
  • Example (Complex Series): Responding units included Engine 1, Captain Smith; Ladder 2, Lieutenant Davis; and Rescue 4, Paramedic Wilson.
• Colons: Use a colon after an independent clause to introduce a list, direct quote, or formal summary.
  • Example: The overhaul team inspected the following areas: attic joists, wall cavities, and window frames.

3. Apostrophes: Possessive Nouns vs. Plural Nouns

A common area of failure on the NFSI is misusing apostrophes with plural nouns or possessives.

• Singular Possessive: Add 's (e.g., the firefighter's helmet = helmet belonging to one firefighter).
• Plural Possessive: Add an apostrophe after the s for regular plural nouns (e.g., the firefighters' helmets = helmets belonging to multiple firefighters).
• Plural Nouns (No Ownership): Do NOT use an apostrophe (e.g., Three firefighters entered the structure).
• The "Its" vs. "It's" Trap:
  • Its = possessive pronoun (e.g., The engine lost its power steering fluid).
  • It's = contraction for "it is" or "it has" (e.g., It's vital to wear full PPE).

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Sentence Faults and Correction Matrix

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Punctuation and Sentence Structure Editing Checklist

When reviewing incident report text on the NFSI exam, apply this systematic 4-step checklist:

1. Verify Complete Thoughts: Ensure every sentence contains an explicit subject and predicate verb. Re-attach dependent clauses that start with words like because, although, after, while, or since to their main clause.
2. Scan for Comma Splices: Identify all commas that sit between two complete sentences. Confirm that each is accompanied by a coordinating conjunction (FANBOYS) or replaced with a period or semicolon.
3. Audit Lists for Parallelism: Verify that all verbs or action phrases in a series use matching grammatical structures (e.g., all past-tense verbs or all infinitive phrases).
4. Inspect Possessives and Contractions: Check every apostrophe. Ensure possessive nouns ending in s have apostrophes in the correct position (firefighter's vs. firefighters') and verify that its is used for possession while it's is used exclusively for "it is."