In IELTS Writing and Speaking, grammar is judged on range and accuracy. Range means a mix of sentence types, such as simple, complex and sentences. Accuracy means how often your sentences are free from errors, and whether errors stop the reader from understanding you.
How grammar is judged
In both the Writing and the Speaking test, grammar is one of four criteria. It is called Grammatical Range and Accuracy. Your grammar is judged by the overall pattern in what you produce, not by a count of every slip. Two questions matter.
The first question is about range. Do you use only short, simple sentences, or can you also build longer sentences with clauses, conditions, passives and different tenses? The second question is about accuracy. How often do errors appear, and do they make the meaning hard to follow?
These two ideas pull in different directions. If you use only safe sentences, your accuracy may be high, but your range looks narrow. If you try difficult structures you cannot control, you will make errors, and the meaning may suffer. The best approach is to use a small set of structures that you know well, in a variety of ways.
The foundations: sentence structure
Before any advanced structure, make sure every sentence is complete. A complete sentence has a subject and a main verb. Check for missing verbs, missing subjects and sentences that are really two sentences joined by a comma.
Then check the basics that appear in almost every answer: the third person s (She works), plural nouns (two problems), articles (a, an, the), and subject-verb agreement (The number of students has increased). These errors are small, but when they repeat, they affect accuracy in every paragraph.
- Complete sentences with a subject and a verb
- Subject-verb agreement, including after phrases like the number of
- Plural and nouns, such as information and advice
- Articles: a, an, the or no article
- Correct prepositions after common verbs and adjectives
Tenses and time
Time control is one of the clearest signs of accuracy. In Writing Task 1 for the Academic test, you must match the tense to the time in the data: past simple for past dates, present perfect for change up to now, and future forms for predictions. In Task 2, the present simple is the main tense, and the present perfect is useful for recent changes.
In Speaking Part 1 and Part 3, listen to the tense in the question and answer in the same time frame. In Part 2, plan your tenses before you start. If the topic is a past experience, use the past simple for events and the past continuous for background.
Building range with complex sentences
Range is not about rare words or long sentences. It is about using different types of structure on purpose. A good set to master includes subordinate clauses (although, because, while), (who, which, that), (if, unless), the for processes and general statements, and comparatives for Task 1.
In Task 2, one clear conditional sentence or one well-built relative clause is more useful than five sentences with a risky structure. Choose structures that help you make your point, and check them for accuracy.
- Many people travel by car. · Although many people travel by car, public transport is cheaper.
- Cities are growing. They face new problems. · Cities, which are growing quickly, face new problems.
Grammar in speaking is different from grammar in writing
Speech is faster and less planned, so some small slips and self-repairs are natural. What matters is control. Can you start a longer sentence and finish it? Can you talk about the past, the present and the future without losing the tense? Do you use because, although and if in a natural way?
In writing, you have time to check, so mistakes in sentence boundaries, punctuation and agreement count more. Reread your essay once for these three points before you stop. A short final check is one of the most useful grammar habits you can build.
A practical plan
Write a short paragraph every few days and keep a list of your own errors. Group them by type. Many learners find that a few error types cause most of their mistakes. Work on one type at a time until it disappears from your writing.
In Speaking, record yourself answering a Part 2 question and listen for the same errors. Slow down slightly. A calm, accurate sentence is better than a fast, broken one. Finally, practise a small set of flexible structures until they become automatic, and then add one new structure at a time.
Who finds this hard?
- Japanese speakers: Japanese has no articles and no plural endings, so these two areas often need special practice.
- Chinese speakers: Chinese verbs do not change for tense or agreement, so tense and subject-verb agreement are common sources of error.
- Arabic speakers: Arabic has no present tense verb to be and a different article system, so missing verbs and article choices need attention.
- Turkish speakers: Turkish puts the verb at the end and has no definite article, so word order and articles are frequent problems.
IELTS tip
For Writing, aim to have every sentence complete and add two or three complex structures that you control, such as a , a and a contrast clause. For Speaking, answer in the tense of the question and use a longer sentence when you have a reason or an example to give.
Frequently asked questions
How is grammar judged in IELTS?
Grammar is judged on range, which is the variety of structures you use, and accuracy, which is how free your sentences are from errors. Both matter.
Do I need advanced grammar to do well?
You need a mix of structures that you can use accurately. Advanced structures help only when you control them.
Is one grammar mistake a problem?
No. The overall pattern of your language matters more than one slip. A single slip matters much less than the same error repeated in every paragraph.
Which grammar should I study first?
Start with complete sentences, tenses, agreement and articles, then add complex sentences and .
Sources
- Swan, M. (2016). Practical English Usage (4th ed.). Oxford University Press.
- Carter, R. and McCarthy, M. (2006). Cambridge Grammar of English. Cambridge University Press.