What you'll learn
Recognising and correcting sentence errors is a core skill for CSEC English A, tested directly in Paper 1 multiple-choice items and rewarded throughout the expression marks of Paper 2. The most common faults are fragments (incomplete sentences), run-ons and comma splices (sentences joined incorrectly), and dangling or misplaced modifiers (describing words attached to the wrong thing). In this guide you will learn to identify each error, understand why it confuses the reader, and fix it cleanly. Eliminating these faults from your own writing makes every letter, report, story and essay clearer and more accurate, and lifts your expression grade.
Key terms and definitions
Sentence — a complete unit with a subject and a finite verb expressing a full idea.
Fragment — a group of words punctuated as a sentence but missing a subject, a verb, or a complete thought.
Run-on (fused) sentence — two complete sentences joined with no punctuation or linking word.
Comma splice — two complete sentences joined by only a comma.
Modifier — a word or phrase that describes another part of the sentence.
Dangling modifier — a modifier with no clear word to describe.
Misplaced modifier — a modifier sitting next to the wrong word, changing the meaning.
Core concepts
Sentence fragments
A complete sentence needs a subject and a finite verb and must express a complete thought. A fragment lacks one of these: "Because the rain fell heavily." (a subordinate clause left alone) or "Running down the street." (no subject and no finite verb). Fix a fragment by attaching it to a main clause or by adding the missing part: "We stayed indoors because the rain fell heavily."
Run-on (fused) sentences
A run-on joins two complete sentences with nothing between them: "The bell rang the students left." Fix it in one of four ways: (1) a full stop ("The bell rang. The students left."); (2) a semicolon ("The bell rang; the students left."); (3) a comma plus a conjunction ("The bell rang, and the students left."); or (4) a subordinating word ("When the bell rang, the students left.").
Comma splices
A comma splice uses only a comma to join two complete sentences: "It was late, we went home." A comma alone is too weak to join independent clauses. Correct it with the same four methods as a run-on: full stop, semicolon, comma + conjunction, or subordination ("Because it was late, we went home.").
Dangling modifiers
A dangling modifier opens a sentence with a description that has no logical subject to attach to: "Walking to school, the rain began to fall." This says the rain was walking. Fix it by giving the modifier a clear subject: "Walking to school, I felt the rain begin to fall," or "As I walked to school, the rain began to fall."
Misplaced modifiers
A misplaced modifier sits beside the wrong word and distorts the meaning: "She served sandwiches to the children on paper plates." Were the children on paper plates? Move the modifier next to what it describes: "She served the children sandwiches on paper plates." Place describing words as close as possible to the word they modify.
Why these errors matter
Each fault either leaves a thought incomplete or links ideas wrongly, forcing the reader to pause and reinterpret. Clear sentence boundaries and correctly placed modifiers let your meaning come through at once — exactly what examiners reward.
Worked examples
Example 1: Fixing a fragment (Paper 1 style)
Identify and correct: "Although she studied very hard for the examination."
This is a fragment — a subordinate clause with no main clause. Add a main clause: "Although she studied very hard for the examination, she was still nervous." The thought is now complete.
Example 2: Fixing a comma splice (Paper 2 expression)
Correct: "The match was exciting, the home team won."
Two complete sentences are joined by only a comma. Use a comma plus a conjunction: "The match was exciting, and the home team won." (A full stop or semicolon would also be correct.)
Example 3: Fixing a dangling modifier (Paper 1 style)
Correct: "After finishing the test, the bell rang."
The bell did not finish the test. Give the modifier a logical subject: "After finishing the test, the students heard the bell ring," or "After the students finished the test, the bell rang."
Common mistakes and how to avoid them
Punctuating a subordinate clause as a sentence. Words like because, although, when, if, since begin clauses that must attach to a main clause.
Joining two sentences with a comma. A comma cannot link two complete thoughts; use a full stop, semicolon, or comma + conjunction.
Leaving an opening modifier dangling. The word right after an introductory phrase must be the thing doing the action.
Placing modifiers far from what they describe. Keep "only", "almost" and descriptive phrases next to the correct word.
Mistaking a long sentence for a run-on, or a short one for a fragment. Length is not the issue — check for a subject, a finite verb, and a complete thought.
Exam technique for Sentence Errors
Test each sentence for a subject and finite verb. If either is missing, it is a fragment.
Watch for two complete thoughts. If you find two, make sure they are joined correctly (full stop, semicolon, or comma + conjunction).
Check the word after an opening phrase. It must be what the phrase describes, or you have a dangling modifier.
Position modifiers next to their target to keep the meaning exact.
Proofread in Paper 2. A deliberate read-through for these three faults removes the most common expression errors quickly.
Quick revision summary
Three sentence faults cost marks at CSEC. A fragment is an incomplete sentence missing a subject, a finite verb, or a complete thought (often a stray subordinate clause beginning with because/although/when) — fix it by attaching it to a main clause. A run-on fuses two complete sentences with nothing between them, and a comma splice joins them with only a comma; correct both with a full stop, a semicolon, a comma plus a conjunction, or by subordinating one clause. A dangling modifier opens with a description that has no logical subject ("Walking to school, the rain fell") — give it a clear doer. A misplaced modifier sits beside the wrong word and distorts meaning — move it next to what it describes. Length is not the test: check every sentence for a subject, a finite verb and a complete idea, ensure two complete thoughts are joined correctly, and place modifiers next to their targets. Proofreading for these three errors sharpens your writing and protects your expression grade.