Why These Two Errors Cost You the Most Marks
In 8 years of marking student essays, I can tell you this: sentence fragments and run-on sentences are the two grammar errors that drop essay bands faster than anything else. Not spelling mistakes. Not wrong tenses. Fragments and run-ons.
Why? Because they break the fundamental unit of English writing — the sentence. An examiner reading a fragmented essay cannot follow your ideas. An examiner reading a run-on essay gets lost in a tangle of connected clauses. Both result in the same outcome: your essay scores in a lower band than your ideas deserve.
The good news is that both errors follow predictable patterns, and once you learn to spot them, they are straightforward to fix.
What Is a Sentence Fragment?
A sentence fragment is an incomplete sentence that is punctuated as if it were complete. It is missing something essential — usually a subject, a main verb, or it is a dependent clause standing alone.
Type 1: Missing Subject
Fragment: Went to the library after school.
Who went to the library? There is no subject. This is a common error when Malaysian students write quickly.
Fixed: She went to the library after school.
Type 2: Missing Main Verb
Fragment: The students in the classroom very noisy.
There is a subject (“the students”) but no main verb. In Malay, you can say “Pelajar-pelajar sangat bising” without an explicit verb. In English, you cannot.
Fixed: The students in the classroom were very noisy.
This is one of the most frequent errors for Malaysian students because Malay does not always require an explicit “to be” verb. If you catch yourself writing a sentence without a verb, add the correct form of “is/are/was/were.”
Type 3: Dependent Clause Alone
Fragment: Because she studied every night.
This has a subject (“she”) and a verb (“studied”), so it looks complete. But the word “because” makes it a dependent clause — it cannot stand alone. It needs a main clause to complete the thought.
Fixed: She scored an A because she studied every night.
Or: Because she studied every night, she scored an A.
Common dependent clause starters to watch for: because, although, when, while, if, since, after, before, unless, until, even though.
If your sentence begins with one of these words, check that it connects to a main clause.
What Is a Run-On Sentence?
A run-on sentence is the opposite problem: two or more complete sentences joined without proper punctuation or a connecting word.
Type 1: Comma Splice
Run-on: She studied hard for the exam, she scored an A.
These are two complete sentences joined by only a comma. A comma alone cannot connect two independent clauses. This is called a “comma splice” and it is extremely common in SPM essays.
Fix options:
| Strategy | Example |
|---|---|
| Period | She studied hard for the exam. She scored an A. |
| Semicolon | She studied hard for the exam; she scored an A. |
| Conjunction | She studied hard for the exam, so she scored an A. |
| Subordination | Because she studied hard for the exam, she scored an A. |
Type 2: Fused Sentence
Run-on: She studied hard for the exam she scored an A.
Two complete sentences with no punctuation at all between them. The reader has to figure out where one thought ends and the next begins.
Fixed: She studied hard for the exam. She scored an A.
How to Spot These Errors in Your Own Writing
Most students cannot identify fragments and run-ons in their own work because they know what they meant to say. Here are three techniques that help:
The Read-Aloud Test
Read your essay out loud, slowly. At every period, stop completely. If a sentence sounds incomplete when you pause — like it needs something more — it might be a fragment. If you run out of breath before reaching the period, it might be a run-on.
The Subject-Verb Check
Go through each sentence and circle the subject and underline the main verb. If you cannot find both, you have a fragment. This is systematic and reliable — I recommend it for students who struggle with sentence structure.
The Conjunction Test
If a sentence has two “subject + verb” pairs with no conjunction (and, but, so, or, yet) or proper punctuation (semicolon, period) between them, it is a run-on.
Before and After: Real Student Essay Examples
Here are examples based on typical Malaysian student essays, showing the original error and the corrected version.
Example 1: Narrative Essay
Before (fragments): I woke up early that morning. Feeling nervous about the exam. My mother prepared breakfast. Which I could hardly eat. Because my stomach was churning.
After: I woke up early that morning, feeling nervous about the exam. My mother prepared breakfast, which I could hardly eat because my stomach was churning.
Notice how the fragments (“Feeling nervous about the exam,” “Which I could hardly eat,” “Because my stomach was churning”) are all dependent elements that need to attach to a main clause.
Example 2: Argumentative Essay
Before (run-ons): Social media has many benefits, it connects people across the world, students can use it for education, however some people become addicted to it they spend too many hours scrolling.
After: Social media has many benefits. It connects people across the world, and students can use it for education. However, some people become addicted to it. They spend too many hours scrolling.
The original was one long run-on with comma splices and fused sentences. Breaking it into proper sentences makes each point clear and distinct.
Example 3: Mixed Errors
Before: Although the government has implemented many programs. The pollution problem still serious, many factories continue to release waste into rivers they do not follow the regulations.
After: Although the government has implemented many programs, the pollution problem is still serious. Many factories continue to release waste into rivers because they do not follow the regulations.
Three errors fixed: a fragment (“Although the government…”), a missing verb (“still serious” to “is still serious”), and a fused sentence (factories + they).
Quick Fix Strategies
| Error | Quick Fix |
|---|---|
| Fragment: missing subject | Add a subject (who or what?) |
| Fragment: missing verb | Add the correct form of the verb |
| Fragment: dependent clause alone | Attach it to the nearest main clause |
| Run-on: comma splice | Replace comma with period, semicolon, or add conjunction |
| Run-on: fused sentence | Add a period or semicolon between the two sentences |
Practice Exercise
Read the following paragraph and identify the fragments and run-ons. Then rewrite the corrected version:
Education is important for young people. Because it opens doors to opportunities. Students should study hard, they should also participate in co-curricular activities these activities teach teamwork. Although some students find it difficult to balance both. With proper time management, they can succeed.
Corrected version:
Education is important for young people because it opens doors to opportunities. Students should study hard, and they should also participate in co-curricular activities. These activities teach teamwork. Although some students find it difficult to balance both, with proper time management they can succeed.
Building the Habit
Fixing fragments and run-ons is not about memorising rules. It is about building the habit of checking every sentence you write. After you finish an essay draft, go back and do the subject-verb check on every sentence. Within a few weeks, you will start catching these errors automatically.
For more on building strong sentences, read our guide on complex sentence structures and transition words that connect ideas properly.
If grammar errors are pulling down your essay scores and you want targeted practice, message us on WhatsApp. We identify your specific error patterns and give you focused exercises to fix them — most students see improvement in their essay scores within the first 3 months.