How to Improve English Grammar for IELTS and CELPIP

Grammar isn't graded the way you think it is

In both IELTS and CELPIP, grammar is never scored on its own. It sits inside Writing and Speaking as one of several criteria — alongside vocabulary, coherence, and task fulfilment. That means a grammatically perfect answer with weak ideas or poor organization still won't score well, and a slightly imperfect answer with strong range and mostly accurate control can still reach a high band.

IELTS calls this criterion 'Grammatical Range and Accuracy.' Notice both words matter: range (variety of structures) and accuracy (correctness). CELPIP folds grammar into 'Vocabulary' and 'Task Fulfilment/Coherence' descriptors in Writing and Speaking, but examiners are trained to notice the same thing — can you use more than simple sentences, and do you do it reliably?

This changes how you should practise. Memorizing grammar rules in isolation (like studying a textbook chapter on the present perfect) rarely transfers to test performance. What works is identifying the specific structures examiners reward, then drilling them inside real task responses.

The grammar that actually moves your score

Not all grammar is equal in value. A handful of structures show up again and again in high-band writing and speaking samples for both exams, because they let you express complex ideas efficiently.

• Complex sentences with subordinate clauses — 'Although public transport is cheaper, many people still prefer driving because it saves time.' This single sentence shows contrast and cause, which examiners read as range.
• Relative clauses — 'The policy, which was introduced last year, has reduced traffic by ten percent.' These let you add detail without starting a new sentence.
• Conditionals (especially second and third) — 'If the government invested more in cycling infrastructure, fewer people would drive.' Conditionals signal you can discuss hypotheticals, a skill Task 2 essays and CELPIP Writing Task 2 both reward.
• Passive voice used deliberately — 'The bridge was completed in 2019' — useful for formal or academic tone, but only when it's the natural choice, not forced.
• Modal verbs for hedging and speculation — 'This could suggest...', 'It might be argued that...' — these are essential for Task 2 discussion essays and CELPIP's opinion-based writing.
• Correct verb tense sequencing across a paragraph — this is where accuracy is judged most harshly, because tense-switching errors are easy for examiners to spot.

Common error patterns that quietly cap your score

Certain mistakes recur across nearly every candidate, regardless of first language, because they involve small words that carry a lot of grammatical weight.

Article errors (a/an/the/no article) are extremely common and are usually forgivable in small doses, but frequent misuse across a response signals inconsistent control. Subject-verb agreement breaks down most often in long sentences, where the writer loses track of the subject by the time they reach the verb — for example, starting with a plural subject and finishing with a singular verb after a relative clause interrupts the sentence.

Preposition errors ('depend of' instead of 'depend on', 'married with' instead of 'married to') are treated as accuracy slips rather than range problems, but they add up. Run-on sentences and comma splices — joining two full sentences with just a comma — are common in timed writing when candidates rush to add ideas without proper connectors.

In speaking, the most damaging pattern is over-reliance on one tense. Many candidates default to present simple for everything, even when describing past experiences or future plans, because it feels safer. This caps range even if accuracy is fine.

Building accuracy and range at the same time

Accuracy and range often get worked on separately, but the fastest progress comes from training them together — by taking sentences you'd naturally write simply, and rebuilding them with a specific structure in mind.

A practical method: write a simple sentence, then rewrite it three times using a different high-value structure each time. For example, start with 'Online learning is popular. It is convenient.' Combine it with a relative clause: 'Online learning, which many students find convenient, has become increasingly popular.' Then a conditional: 'If students value flexibility, they are likely to choose online learning.' Then a modal: 'Online learning could continue to grow as more institutions adopt it.'

This forces you to practise range on command rather than hoping it appears under exam pressure. Do this daily with topics similar to Task 2 or CELPIP Writing prompts, and the structures start appearing naturally in your own responses.

• Keep an error log: after every practice essay or recorded speaking response, write down the 3-5 mistakes that repeat most often. Review this list before your next practice session, not after.
• Read your own writing aloud. Grammar errors that are hard to catch by eye are often audible — a missing verb or wrong tense sounds off even when it looks fine on the page.
• Practise sentence combining daily: take two short sentences from a practice topic and join them with a subordinator (although, because, since, whereas) or a relative pronoun (which, who, that).
• Time yourself. Grammar accuracy usually drops in the last third of a timed response because fatigue and rushing set in — practise writing full responses under real time limits, not just grammar exercises in isolation.

Grammar in speaking is judged differently than in writing

In writing, you have time to plan complex sentences and check them. In speaking, grammar has to come out in real time, so examiners expect more hesitation and self-correction — and that's normal, not penalized on its own.

What does get penalized is grammar so basic that it limits what you can say. If you can only produce short, disconnected sentences on a familiar topic like your hometown, you'll struggle even more on an unfamiliar or abstract prompt. Building a small set of flexible sentence frames — 'One thing that really stands out to me is...', 'What I tend to find is that...', 'If I had to choose, I'd probably say...' — gives you grammar you can deploy under pressure without composing it from scratch.

Self-correction is actually a positive signal when done naturally: saying 'I go — I mean, I went there last year' shows monitoring, which examiners see as a feature of higher-level control, not just an error.

A realistic weekly practice structure

Grammar improvement is slow and cumulative — there's no single lesson that fixes it, so consistency matters more than intensity. A sustainable structure works better than occasional long study sessions.

• 2-3 short writing tasks per week, each reviewed specifically for grammar (not just content), using your error log to check whether repeated mistakes are decreasing.
• Daily 10-minute sentence-combining drills using whatever topic you're currently studying, so grammar practice stays connected to real test content.
• Weekly recorded speaking practice, played back once for content and once purely for grammar — tense consistency, subject-verb agreement, and structure variety.
• Regular review of your error log rather than generic grammar exercises — targeting your actual patterns is far more efficient than working through a grammar book cover to cover.
• You can practise Writing and Speaking tasks for both IELTS and CELPIP for free on Bandleep, including AI-based feedback that flags grammar patterns — useful for building the kind of error log described above, though remember any AI score is a practice estimate, not an official result.