Introduction: Building Strong Sentences
Have you ever tried to read a story where the sentences were either too short and made no sense, or so long that you ran out of breath just reading them in your head? Writing clear sentences is like building a sturdy bridge. If a piece is missing, the bridge collapses (that's a sentence fragment). If you cram too many pieces together without the right glue, the bridge becomes a mess (that's a run-on sentence).
In this chapter, we will learn how to spot these common mistakes and fix them. This will help you express your ideas clearly in your writing, whether you are writing a letter to a friend or an article for your school magazine. For more on how sentences are built, you can also look at our chapter on Simple, compound and complex sentences.
Part 1: Sentence Fragments (The Missing Pieces)
A sentence fragment is an incomplete sentence. It is a group of words that pretends to be a sentence but is actually missing a vital part. To be a complete sentence, a group of words needs three things:
1. A subject (who or what the sentence is about).
2. A verb (the action or state of being).
3. A complete thought (it must make sense on its own).
Common Types of Fragments
1. The Missing Subject:
Example: Went to the Hong Kong Space Museum yesterday.
The Problem: Who went? We don't know the subject.
The Fix: Add a subject. "My class went to the Hong Kong Space Museum yesterday."
2. The Missing Verb:
Example: The beautiful sunset over Victoria Harbour.
The Problem: What about the sunset? There is no action word.
The Fix: Add a verb. "The beautiful sunset over Victoria Harbour was amazing."
3. The "Leftover" Idea:
Sometimes, we write a descriptive phrase but forget to attach it to a main idea.
Example: Because it was raining.
The Problem: This is a reason, but what happened because of the rain? It's an incomplete thought.
The Fix: Connect it to a complete sentence. "We stayed indoors because it was raining."
Key Takeaway: If a sentence feels like a "cliffhanger" or is missing a "who" or a "does," it is probably a fragment!
Part 2: Run-on Sentences (The Traffic Jam)
A run-on sentence happens when two or more complete sentences (independent clauses) are pushed together without the correct punctuation or "glue" (conjunctions) to separate them. Think of it like two cars trying to occupy the same space at the same time—it causes a crash!
Two Main Types of Run-ons
1. The Fused Sentence: Two sentences joined with absolutely nothing between them.
Example: I love playing basketball it is my favourite hobby.
The Fix: Use a full stop. "I love playing basketball. It is my favourite hobby."
2. The Comma Splice: Two sentences joined by only a comma. (This is a very common mistake!)
Example: The exam was difficult, I think I did well.
The Fix: Use a conjunction like 'but'. "The exam was difficult, but I think I did well."
How to Fix a Run-on Sentence
Don't worry if this seems tricky! There are three easy ways to fix a run-on:
Method A: Use a Full Stop (Period)
Make them into two separate sentences. This is best if the ideas are distinct.
"The library is quiet. I can study there."
Method B: Use a Conjunction
Use words like and, but, or, so, or because (with a comma if needed).
"The library is quiet, so I can study there."
Method C: Use a Semicolon
If the two ideas are very closely related, you can use a semicolon (\(;\)).
"The library is quiet; I can study there."
Key Takeaway: Every complete idea needs its own space or a strong bridge (conjunction) to connect it to the next one.
Common Mistakes to Avoid
The "Because" Trap
Many students start a sentence with "Because..." and then stop. Remember, if you start with a reason, you must finish the thought!
Wrong: Because I was tired.
Right: Because I was tired, I went to bed early.
The "Then" Mistake
Using "then" to join two sentences with just a comma is a common run-on error.
Wrong: We ate lunch, then we went to the cinema.
Right: We ate lunch, and then we went to the cinema. (Or use a full stop before "Then").
Quick Review: The Sentence Test
To check if your sentence is correct, ask yourself these three questions:
1. Is there a subject? (The "Who")
2. Is there a verb? (The "Action")
3. Is it a complete thought? (Does it make sense alone?)
4. Are there too many ideas joined without a full stop or conjunction?
Did you know?
In poetry or song lyrics, writers sometimes use fragments on purpose to create a certain rhythm or feeling. However, in school writing and exams, it is important to use complete, correctly joined sentences to show you have good control of the language!
Summary Checklist
Sentence Fragments
Check: Is it a piece of a sentence? Is the subject or verb missing?
Fix: Add the missing part or join it to the sentence before or after it.
Run-on Sentences
Check: Are two sentences squashed together? Is there a "comma splice"?
Fix: Use a full stop, a semicolon, or a conjunction (like and, but, or so).