What you'll learn
Sentence errors are among the most reliably tested items in CXC CSEC English Language Paper 1, and among the most expensive faults in Paper 2, where they undermine the technical accuracy marks on every piece of writing. This topic covers four distinct faults that all concern the structure of a sentence rather than the choice of words: the fragment, which is incomplete; the run-on and comma splice, which join independent clauses incorrectly; the dangling modifier, which describes something absent from the sentence; and the misplaced modifier, which describes the wrong thing. By the end of this guide you should be able to test any group of words for completeness, identify and repair all four fault types by several different methods, recognise the acceptable sentence fragment used deliberately for effect, and proofread your own writing systematically for these errors under time pressure.
Key terms and definitions
Independent clause — a group of words with a subject and a finite verb that expresses a complete thought and can stand alone as a sentence
Dependent clause — a clause with a subject and verb that cannot stand alone, usually introduced by a subordinating conjunction
Sentence fragment — a group of words punctuated as a sentence but lacking a subject, a finite verb, or completeness of thought
Run-on sentence — two or more independent clauses joined with no punctuation or conjunction between them
Comma splice — two independent clauses joined by a comma alone
Coordinating conjunction — one of for, and, nor, but, or, yet, so, remembered by the mnemonic FANBOYS
Subordinating conjunction — a word such as although, because, while, since, if, when or unless that makes a clause dependent
Conjunctive adverb — a linking word such as however, therefore, moreover, nevertheless or consequently
Modifier — a word or phrase that describes another element in the sentence
Dangling modifier — a modifier whose intended subject does not appear in the sentence
Misplaced modifier — a modifier positioned so that it appears to describe the wrong element
Core concepts
Testing for a complete sentence
Every sentence needs three things: a subject, a finite verb, and a complete thought. Missing any one produces a fragment.
Running along the beach at sunrise. has no subject and no finite verb; running is a participle, not a finite verb.
The candidates who submitted their portfolios before the deadline. has a subject and verbs, but who submitted is a relative clause modifying candidates, so the group never reaches a main verb and the thought is incomplete.
Although the weather improved considerably. has a subject and a finite verb, but although makes the clause dependent, so it cannot stand alone.
A useful test is to place the words after It is true that. If the result makes sense, the words form a complete thought.
Repairing fragments
There are three repairs, and choosing between them is a matter of meaning and rhythm.
Attach the fragment to the sentence beside it: Although the weather improved considerably, the match was abandoned.
Supply what is missing: The candidates who submitted their portfolios before the deadline were interviewed on Monday, where a main verb has been added.
Rewrite the fragment as a complete sentence: We were running along the beach at sunrise.
Deliberate fragments
Not every fragment is an error. Experienced writers use them for emphasis, particularly in narrative and persuasive writing: The crowd fell silent. Utterly silent.
CSEC examiners accept deliberate fragments where the effect is clearly controlled and the surrounding writing demonstrates full command of sentence structure. The risk is that an accidental fragment looks identical to a deliberate one, and the benefit of the doubt goes to candidates whose writing is otherwise accurate. Use them sparingly, and never in formal writing such as reports or formal letters.
Run-on sentences and comma splices
A run-on joins independent clauses with nothing between them: The bus was late we missed the opening ceremony.
A comma splice joins them with a comma alone: The bus was late, we missed the opening ceremony.
Both are the same underlying fault — two complete sentences incorrectly joined — and both have the same five repairs.
Use a full stop and start a new sentence: The bus was late. We missed the opening ceremony.
Use a comma plus a coordinating conjunction: The bus was late, so we missed the opening ceremony. Note that the comma alone is wrong and the conjunction alone is acceptable in short sentences, but the two together are always correct.
Use a semicolon, where the two ideas are closely related: The bus was late; we missed the opening ceremony.
Use a subordinating conjunction to make one clause dependent: Because the bus was late, we missed the opening ceremony.
Use a colon, where the second clause explains or illustrates the first: The outcome was predictable: we missed the opening ceremony.
The conjunctive adverb trap
Words such as however, therefore, moreover, nevertheless, consequently, furthermore and otherwise feel like conjunctions but are adverbs. They cannot join two independent clauses with a comma.
Incorrect: The road was closed, however we found another route.
Correct with a semicolon: The road was closed; however, we found another route.
Correct with a full stop: The road was closed. However, we found another route.
This is one of the most frequently tested points in the whole topic, because the error sounds entirely natural. The rule to remember is that FANBOYS words take a comma; however and its relatives take a semicolon or a full stop.
Dangling modifiers
A modifier dangles when the thing it describes is not present in the sentence. Introductory participial phrases are the usual source.
Walking through the market, the aroma of fresh bread was irresistible. Grammatically, the aroma is walking through the market, which is absurd. The person walking never appears.
There are two repairs. Name the true subject immediately after the comma: Walking through the market, I found the aroma of fresh bread irresistible. Or rewrite the modifier as a full clause: As I walked through the market, the aroma of fresh bread was irresistible.
The reliable check is to ask who or what is doing this? immediately after reading an opening phrase. The answer must be the word that follows the comma.
Misplaced modifiers
A misplaced modifier is present in the sentence but sitting in the wrong position, so it appears to describe the wrong element.
She served sandwiches to the guests on paper plates. The guests appear to be on paper plates. Moving the modifier fixes it: She served sandwiches on paper plates to the guests.
The general principle is that a modifier should sit as close as possible to the word it describes.
Limiting words deserve special attention: only, just, nearly, almost, even and merely change the meaning entirely depending on position. Only she answered three questions means nobody else answered any. She only answered three questions suggests she did nothing else with them. She answered only three questions means the number was three. All three are grammatical; only one will be what you meant.
A squinting modifier sits between two elements and could describe either: Students who revise regularly perform better. Does regularly describe revising or performing? Repositioning removes the doubt: Students who regularly revise perform better.
Worked examples
Example 1: Identifying and repairing a fragment (3 marks)
Identify the fault and correct it: The committee reviewed every application carefully. Because they wanted to be fair to all the candidates who had applied.
The second group of words is a fragment. It has a subject, they, and a finite verb, wanted, but the subordinating conjunction because makes the clause dependent, so it cannot stand alone. The simplest repair attaches it to the preceding sentence: The committee reviewed every application carefully, because they wanted to be fair to all the candidates who had applied. Alternatively the conjunction could be removed: They wanted to be fair to all the candidates who had applied.
Example 2: Correcting a comma splice (3 marks)
Correct this sentence in two different ways: The generator failed during the concert, however the organisers continued with acoustic performances.
However is a conjunctive adverb, not a coordinating conjunction, so it cannot join two independent clauses with a comma. One correction uses a semicolon: The generator failed during the concert; however, the organisers continued with acoustic performances. Another uses a full stop: The generator failed during the concert. However, the organisers continued with acoustic performances. A third option replaces however with a coordinating conjunction: The generator failed during the concert, but the organisers continued with acoustic performances.
Example 3: Repairing a dangling modifier (3 marks)
Explain what is wrong with this sentence and correct it: Having studied for six hours, the examination seemed much easier.
The opening participial phrase having studied for six hours should describe the person who studied, but the word following the comma is examination. As written, the examination did the studying. The person is absent from the sentence altogether, so the modifier dangles. Naming the true subject after the comma corrects it: Having studied for six hours, Marlon found the examination much easier. Alternatively, rewrite the phrase as a clause: Because he had studied for six hours, the examination seemed much easier to Marlon.
Common mistakes and how to avoid them
The most frequent error across all CSEC scripts is the comma splice. Many candidates use commas wherever they would pause in speech. Before writing a comma, check whether what follows could stand alone as a sentence; if it could, the comma alone is insufficient.
Using however with a comma to join clauses is the specific version of this error that examiners test most often. Memorise FANBOYS as the only seven words that take a comma in that position.
Students often fail to spot fragments beginning with which, who, because, although or since, because such fragments are long and sound substantial. Length has nothing to do with completeness.
Dangling modifiers are difficult to see in your own work because you know what you meant. The mechanical check — ask who is performing the opening action, then look at the word after the comma — catches them reliably.
Finally, candidates often place only by habit rather than by meaning. Decide what you are limiting and put only directly before it.
Exam technique for "Usage and Grammar: Sentence Errors"
In Paper 1, cover the punctuation and read each half of the sentence separately. If both halves stand alone, you are looking at a run-on or a splice and the correct option will supply a full stop, a semicolon or a conjunction.
When several options look acceptable, choose the one that best preserves the relationship between the ideas. A subordinating conjunction that expresses cause is better than a neutral and when the sentence describes a cause.
In Paper 2, proofread specifically for sentence boundaries as a separate pass. Read each sentence from full stop to full stop and ask whether it is one complete thought. This single check catches fragments and splices together.
Watch the sentences you write at speed near the end of the paper, where these errors cluster. If time is short, prioritise checking your final paragraph, which is usually the least controlled.
Quick revision summary
A complete sentence needs a subject, a finite verb and a complete thought. Fragments lack one of these and are repaired by attaching them to a neighbouring sentence, supplying what is missing, or rewriting; deliberate fragments are acceptable for effect in narrative but not in formal writing. Run-ons join independent clauses with nothing, and comma splices join them with a comma alone; both are repaired with a full stop, a comma plus a FANBOYS conjunction, a semicolon, a subordinating conjunction, or a colon. Conjunctive adverbs such as however, therefore and moreover require a semicolon or full stop, never a comma alone. A dangling modifier describes something absent from the sentence and is fixed by naming the true subject immediately after the comma or by rewriting the phrase as a clause. A misplaced modifier sits too far from what it describes, and limiting words such as only and just must sit directly before the element they limit.