Punctuation, Style and Final Polish
Once the major grammar errors are fixed, the next layer of marks is punctuation and style. CSS markers reward sentences that are not only grammatical but also crisp, clear and rhythmically controlled.
1. The comma — the most overused mark in English
The comma is a workhorse. It has four chief uses; mastering them eliminates most "comma splice" deductions.
Use 1 — Separating items in a list
We need bread, milk, eggs and cheese. (British style — no comma before and.) We need bread, milk, eggs, and cheese. (American — the "Oxford comma".)
CSS marking accepts either, as long as you are consistent within a script.
Use 2 — Separating independent clauses joined by a coordinating conjunction
I read the book, but my brother preferred the film.
Without the comma, the sentence runs on. Without but, you'd have a comma splice — see below.
Use 3 — Setting off non-essential information
The minister, who arrived late, apologised to the audience.
The clause who arrived late is extra information; commas enclose it. If the clause is essential (defining), drop the commas: The minister who arrived late apologised; the other ministers did not.
Use 4 — After introductory phrases
Despite the rain, the rally went ahead. In 1947, Pakistan came into being. Walking home, I noticed the new shop.
2. Comma splice — the most common punctuation error
A comma splice joins two independent clauses with only a comma.
Wrong: The meeting started late, no one had the agenda.
Three ways to fix it:
- Full stop: The meeting started late. No one had the agenda.
- Semi-colon: The meeting started late; no one had the agenda.
- Conjunction + comma: The meeting started late, because no one had the agenda.
A clause that can stand alone as a sentence — it has a subject and a finite verb, and expresses a complete thought. Two independent clauses cannot be joined by only a comma.
3. Semi-colon and colon
The semi-colon (;) joins two closely related independent clauses without a conjunction.
The strike ended on Friday; production resumed on Monday.
The colon (:) introduces a list, an explanation or a quotation.
The committee had three concerns: cost, time and security. He spoke for one minute: it changed the meeting. Iqbal wrote: "The momin's blood is the spring of all action."
- Comma joins items in a list and connects with a conjunction.
- Semi-colon joins two independent thoughts without a conjunction.
- Colon introduces what follows.
- Full stop ends the sentence.
- Never use double punctuation like ?! or ",." in formal writing.
4. The apostrophe — singular vs plural possessive
- Singular possessive: add 's. The boy's book.
- Plural possessive (regular plural): add ' only. The boys' books.
- Plural possessive (irregular plural): add 's. The children's books.
For names ending in s, both forms are accepted: Jones's or Jones'. Be consistent.
5. Avoid wordiness — style polish
A grammatically correct sentence can still lose marks for verbosity. The fix is usually a swap:
| Wordy | Concise |
|---|---|
| due to the fact that | because |
| in spite of the fact that | although |
| in the event that | if |
| at this point in time | now |
| in the near future | soon |
| has the ability to | can |
| in close proximity to | near |
| as a matter of fact | in fact / indeed |
| make a decision | decide |
| give consideration to | consider |
Worked example — polish
Wordy: Due to the fact that the report has the ability to influence policy, it is recommended that we should give due consideration to it. Polished: Because the report can influence policy, we should consider it carefully.
The same idea, half the words, three times the punch.
6. Common confusables to memorise
- affect (verb, to influence) vs effect (noun, a result).
- principal (head/main) vs principle (rule).
- stationary (not moving) vs stationery (writing materials).
- complement (completes) vs compliment (praise).
- fewer vs less (covered last lesson).
- lay (transitive — lay the book on the table) vs lie (intransitive — I lie down).
These pairs are heavily tested in the pairs of words question — see that lesson — but they also pollute many otherwise good sentences in the correction task.
7. A pre-submission checklist
Before handing in your sentence-correction answers, ask yourself:
- Does every verb agree in number with its subject?
- Does every pronoun match its antecedent?
- Is every modifier next to what it modifies?
- Are list items grammatically parallel?
- Has any comma splice slipped through?
- Have I used apostrophes correctly (its / it's, possessive 's)?
- Could any phrase be shorter without losing meaning?
Run through this list and you will catch 90% of avoidable errors before submission.