Punctuation Basics — GCSE English
Use punctuation accurately to improve your writing grade
Why does punctuation matter?
- Punctuation controls how a reader understands your writing.
- At GCSE, punctuation is assessed as part of your Technical Accuracy marks.
- Correct punctuation can push your grade up significantly.
- You must know: full stops, commas, apostrophes, colons, semi-colons, and inverted commas.
- Even one strong, accurate punctuation choice can earn you marks.
Key Words
- Full stop — Ends a sentence
- Comma — Separates items in a list or clauses in a sentence
- Apostrophe — Shows possession or a contraction (missing letters)
- Colon — Introduces a list, explanation or quotation
- Semi-colon — Joins two closely related independent clauses
Commas and full stops
- Every sentence must end with a full stop, question mark or exclamation mark.
- Commas separate items in a list: "She bought apples, oranges, bananas, and grapes."
- Commas also separate clauses: "Although it was raining, they continued walking."
- Do not use a comma to join two full sentences — use a full stop or semi-colon.
- Common error: "It was dark, the moon had not risen." — should be a full stop or semi-colon.
Apostrophes
- Possession: add 's to the owner. "The dog's lead." (one dog)
- Plural possession: add s' after the plural. "The dogs' leads." (more than one dog)
- Contractions: replace the missing letter(s). "Do not" → "Don't". "It is" → "It's".
- Common error: "its" (possession) vs "it's" (it is). "The cat licked its paw." — no apostrophe.
- Never use an apostrophe for a plural: "apple's" to mean more than one apple is wrong.
Colons and semi-colons
- Colon: introduces what follows — a list, explanation or quotation.
- "She had one wish: to go home."
- "He packed the essentials: a torch, a compass, and water."
- Semi-colon: joins two related complete sentences without a conjunction.
- "The sun was setting; they had to move quickly."
- Both clauses must be complete sentences for a semi-colon to be correct.
Worked Examples
Example 1: Correcting errors
- Incorrect: "Its a good idea to plan you're work before you start writing its important."
- Error 1: "Its" should be "It's" (contraction of "it is").
- Error 2: "you're" should be "your" (possession).
- Error 3: Two sentences run together — needs a full stop before "its important."
- Correct: "It's a good idea to plan your work before you start writing. It's important."
Example 2: Using a semi-colon
- Two sentences: "The city was beautiful." "I had never seen anything like it."
- Joined with semi-colon: "The city was beautiful; I had never seen anything like it."
- Both clauses are complete sentences — the semi-colon is correct.
- This is more sophisticated than simply using a full stop.
- Use semi-colons in your creative or analytical writing to show range.
Practice Questions
- Which sentence uses the apostrophe correctly?
Answer: The cat's bowl was empty.
"The cat's bowl" uses an apostrophe correctly to show possession. - Which sentence correctly uses a semi-colon?
Answer: She was exhausted; she had not slept for two days.
A semi-colon joins two complete, related sentences. Both parts here are complete sentences. - When should you use a colon?
Answer: To introduce a list or explanation
A colon signals that what follows expands on or explains what came before. - "Its raining outside." Is this correct?
Answer: No — should be "It's raining"
"It's" is a contraction of "it is." The apostrophe replaces the missing letter. - Which is the correct plural possessive?
Answer: The dogs' leads
For a plural noun ending in s, add the apostrophe after the s: dogs'.
Exam-Style Question
Rewrite the following passage, correcting ALL punctuation errors. There are 6 errors to find. "the students was very excited about they're trip to london. They had been planning it for month's and couldnt wait to see the sights. When they arrived they was amazed by it's size."
Mark Scheme
- 1 mark each: "the" → "The", "they're" → "their", "month's" → "months", "couldnt" → "couldn't", "they was" → "they were", "it's size" → "its size"
Model Answer: "The students were very excited about their trip to London. They had been planning it for months and couldn't wait to see the sights. When they arrived, they were amazed by its size."