Grammar mistakes rarely destroy an argument, but they do something nearly as costly: they make a reader stop. In academic writing, where precision forms part of the assessment, a missing apostrophe reads as carelessness and a comma splice blurs two ideas into one. Most of the errors that turn up in essays, reports and dissertations fall into a handful of familiar categories. Learn to recognise those, and proofreading becomes quicker and far less painful.
1. Subject–verb agreement: find the actual subject
Long noun phrases hide the subject. In The collection of interviews gathered over three years suggests a shift in attitude, the verb agrees with collection, not years. Strip the sentence back: the collection suggests. That single habit resolves most agreement problems.
A few cases are worth memorising:
- Words between subject and verb do not change the verb: the data set, along with its appendices, was…
- Indefinite pronouns such as each, either, neither and nobody take a singular verb; both, few and many take a plural one.
- Collective nouns (the committee, the team, the government) may take either form in British English, depending on whether you mean the group as a unit or its members. Choose one and stay with it.
- Where usage is genuinely divided — data and criteria are the usual suspects — follow your department's preference throughout.
2. Comma splices: two sentences in one coat
A comma splice joins two independent clauses with nothing but a comma:
The results were inconsistent, the sample was too small.
Both halves could stand alone, so a comma is not enough to hold them together. There are four reliable repairs:
- Use a full stop: The results were inconsistent. The sample was too small.
- Use a semicolon when the ideas are tightly linked: The results were inconsistent; the sample was too small.
- Add a coordinating conjunction: The results were inconsistent, and the sample was too small.
- Subordinate one clause: The results were inconsistent because the sample was too small.
A semicolon before however is correct; a comma is not, because however is not a conjunction.
3. Apostrophes: possession, not plurals
An apostrophe marks possession or a missing letter. It never marks a plural. So three students, not three student's; the 1990s, not the 1990's. Possession works like this:
- Singular owner: the student's argument.
- Plural owner ending in s: the students' arguments.
- Plural owner not ending in s: the children's responses.
- Singular name ending in s: styles differ between James's and James', so follow your style guide.
Then there is the classic pair: its is possessive, it's means it is or it has. If you can substitute either expansion and the sentence still works, you need the apostrophe.
4. Tense consistency: choose a timeline and stay on it
Academic writing switches tense for good reasons. Literature reviews usually report other people's arguments in the present: Bennett argues that… Methods describe what you did in the past: Participants completed a short questionnaire. Results follow your discipline's convention, and general truths sit in the present.
Problems appear when tense drifts mid-paragraph without a signal:
The survey was distributed in March and shows that most tutors prefer written feedback.
Either keep both verbs in the past (was distributed… showed) or make the shift deliberate, which usually means the second clause states something still true. Read the last sentence of each paragraph before moving on; that is where drift is easiest to catch.
5. Pronoun reference: who is 'they'?
Pronouns need a clear, nearby antecedent. In When the tutors met the students, they were unsure about the deadlines, the reader cannot tell who was unsure. Name the group: the students were unsure about the deadlines.
Two related habits help. First, give pointing words a noun: This discrepancy suggests… is clearer than This suggests…. Second, singular they is now widely accepted for an unspecified person, but check your style guide, and never let a singular noun and a plural pronoun collide in the same sentence.
6. Tangled modifiers and stray fragments
A modifier at the start of a sentence attaches to the first noun that follows, so the opening phrase must describe that noun:
Having analysed the data, the conclusion was clear.
The conclusion did not analyse the data. Rewrite it: Having analysed the data, we reached a clear conclusion.
Fragments are the mirror image: a group of words punctuated as a sentence but missing a main clause, often beginning with because, although or which. Because the sample was small. needs a second half. Read each sentence and ask whether it could stand alone; if not, reconnect it or add the missing verb.
A ten-minute check before you submit
Proofreading works better as a routine than as a mood. Try this order, which targets the most frequent errors first:
- Read the draft aloud, slowly. Your ear catches fragments and tense slips that your eye forgives.
- Find every comma. At each one, ask whether both sides could stand alone; if so, repair the splice.
- Search for it, this, they and which, and check each has an obvious antecedent.
- Check apostrophes: possession or contraction, never plural.
- Read the first and last sentence of each paragraph in isolation, listening for a change of tense.
- Confirm that spelling and formatting follow your department's style guide.
None of these fixes asks you to change what you think. They simply let the reader follow the thinking without tripping over the surface. Run the check once, and the next draft will already be cleaner.
Photo: guvo59 / Pixabay
