Common IELTS Mistakes and How to Fix Them: 10 Tips for 2026

IELTS candidates may understand English grammar rules and still lose marks because of small, repeated errors in speaking and writing. Subject-verb agreement, incorrect articles, inconsistent tenses, and poorly structured sentences can affect grammatical accuracy. Common IELTS Mistakes and How to Fix Them focuses on ten grammatical errors that candidates should identify and correct while preparing for the examination.

The key is not to memorise every grammar rule but to apply it correctly while communicating. Using shorter sentences, checking word forms, choosing appropriate prepositions, and revising written answers can help you improve accuracy. These IELTS tips 2026 focus on the grammatical habits discussed in the lesson and explain how to address them during practice.

Common IELTS Mistakes and How to Fix Them

Candidates may lose marks because of small grammatical errors, even when they understand English grammar and use advanced vocabulary. The following ten common mistakes highlight what to correct and how to improve grammatical accuracy in IELTS Speaking and Writing.

1. Correct Subject-Verb Agreement

Subject-verb agreement is a common source of errors in IELTS Speaking and Writing. Candidates may know the relevant grammar rules but apply them incorrectly when speaking quickly or constructing sentences under pressure.

For example, consider the sentence “The number of students are increasing.” The correct version is “The number of students is increasing.” The main subject is number, which is singular, rather than students, which is plural.

How to fix it: Identify the main subject before selecting the verb. Do not let the words between the subject and verb distract you from the actual grammatical structure. Practise making short sentences so that the placement of the subject, helping verb, main verb, and object remains clear. 

This habit can also help you avoid IELTS band score mistakes caused by basic grammatical inaccuracies.

2. Understand Countable and Uncountable Nouns

Countable nouns can be counted individually, while uncountable nouns generally refer to things that are not counted as separate units. Using the wrong form can make a sentence grammatically incorrect.

Words such as information, advice, equipment, research, knowledge, furniture, luggage, traffic, and homework are usually uncountable.

For example, write “I need some information” instead of “I need some informations.” Similarly, use “a piece of advice” rather than “an advice.”

How to fix it: Review common uncountable nouns during your preparation and check whether the nouns in your sentences require singular or plural forms.

3. Use Articles Correctly

Articles such as “a,” “an,” and “the” are small words, but using them incorrectly can affect sentence accuracy.

Use “a” or “an” when referring to a nonspecific singular countable noun. The choice depends on the initial sound of the following word, not simply its first letter. For example, “She is an engineer” is correct.

Use “the” when referring to a specific person or thing. For example, “I bought a new laptop” introduces the laptop, while “The laptop is expensive” refers to that specific laptop.

How to fix it: Practise identifying whether a noun is specific or general before selecting an article.

4. Choose the Correct Prepositions

Prepositions and collocations determine how words fit together naturally. Choosing the wrong combination can make an otherwise understandable sentence incorrect.

For example, write “discuss the problem” rather than “discuss about the problem.” Other correct combinations include “married to,” “good at,” and “interested in.”

How to fix it: Instead of memorising prepositions separately, learn them alongside the words they commonly accompany. While practising IELTS Writing and Speaking, check whether you have used the correct word combinations.

These IELTS exam mistakes can often be reduced by reviewing your recurring errors and practising correct expressions in complete sentences.

5. Avoid Run-On Sentences

Run-on sentences occur when two or more independent statements are joined without appropriate punctuation or a suitable connecting structure. Such sentences can make your writing difficult to follow.

For example:

• Incorrect: Technology has changed education students can now study online.

• Correct: Technology has changed education. Students can now study online.

The corrected version separates two complete statements with a full stop. Appropriate punctuation helps readers understand where one idea ends and another begins.

How to fix it: Check whether each sentence contains more than one complete thought. Use full stops, commas where grammatically appropriate, and suitable connecting words to establish clear relationships between ideas. These IELTS Writing mistakes can be addressed by reviewing punctuation and sentence structure after completing a response.

6. Maintain Tense Consistency

Tense errors occur when verbs do not match the time being described. Switching between past, present, and future without a clear reason can confuse readers and listeners.

For example, “Yesterday, I went to the market and bought vegetables” correctly uses the past tense for both actions.

Similarly, “Nowadays, people prefer online shopping” uses the present tense to describe a current trend.

How to fix it: Identify the time frame before constructing a sentence. Check whether the verbs match that time frame and whether any change in tense is justified by the meaning. Maintaining consistency is one of the practical ways to address IELTS exam mistakes related to grammar.

7. Avoid Unnecessary Passive Voice

Passive voice is useful when the person performing an action is unknown or unimportant. It can also be appropriate in reports and IELTS Writing Task 1 responses.

However, using passive voice in every sentence can make your writing less direct.

For example, “The report was prepared by the students” is passive, while “The students prepared the report” is active. The active version places emphasis on the people performing the action.

In IELTS Writing Task 1, particularly when describing graphs and reports, passive voice may be appropriate when the focus is on the action or the data rather than the person responsible.

How to fix it: Decide what information deserves emphasis. Use passive voice when the doer is unknown or unimportant, and choose active voice when the subject needs to remain clear. Do not assume that passive sentences automatically demonstrate stronger grammar.

8. Missing Plural Forms

Forgetting plural endings is another frequent grammar problem. When referring to more than one person, object, or place, make sure the noun has the appropriate form.

For example, write “many students” instead of “many student.” Similarly, “Different countries have different cultures” correctly uses plural nouns and a plural verb.

Check the relationship between quantities and nouns, and ensure that the verb agrees with the subject. Careful proofreading can help you identify missing plural endings before submitting your response.

9. Incorrect Relative Clauses

Relative clauses provide additional information about people, things, or places. Using the wrong relative word can affect sentence meaning and grammatical accuracy.

Use “who” when referring to people, “which” when referring to things, and “where” when referring to places.

For example:

• “People who live abroad may learn about different cultures.”

• “The city where I lived was peaceful.”

• “The city that I visited was crowded.”

Choose the relative word according to the noun being described and the meaning you want to communicate. Practise combining related ideas into sentences without making the structure unnecessarily complicated.

10. Writing Unnecessarily Long Sentences

Long sentences do not automatically lead to a higher IELTS band score. If a sentence contains too many ideas, misplaced connectors, or grammatical errors, it can reduce clarity.

Instead of joining several ideas into one complicated sentence, divide them into shorter, meaningful sentences. Use connectors only when they show a clear relationship between ideas.

For example, explain one main point in a sentence and introduce its supporting detail in the next sentence when appropriate.

Common IELTS Mistakes and How to Fix Them focuses on accuracy rather than sentence length. Prioritise clear expression, appropriate punctuation, and correct grammar instead of trying to make every sentence complex.

How to Improve IELTS Band Score Through Regular Revision

Candidates should not assume that knowing a rule guarantees its correct use in an examination.

Follow these revision habits:

• Review written answers after completing them.

• Check subject-verb agreement, articles, prepositions, and plural forms.

• Look for tense changes that do not match the intended time frame.

• Break run-on sentences into clear statements.

Revision gives you another opportunity to identify mistakes that may not be obvious while writing. The same principle applies to speaking practice: pay attention to recurring errors rather than focusing only on fluency or vocabulary.

Explore the Online IELTS Classes to access essential resources for IELTS exam preparation, including detailed insights and strategies. Dive into the IELTS 2026 for structured courses and focused study plans designed to help aspirants in their exams.