IELTSFebruary 16, 2026·6 min read

5 Common Grammar Mistakes in IELTS Speaking

Learn about the most common grammar errors students make in IELTS Speaking and how to avoid them for a higher band score.

Grammar accuracy plays a crucial role in determining your IELTS Speaking band score. Even fluent speakers can lose marks due to persistent grammatical errors. In this post, we'll explore the five most common grammar mistakes students make and how to correct them.

1. Subject-Verb Agreement Errors

One of the most frequent mistakes is failing to match subjects with verbs correctly. This often happens when speaking quickly or when the subject is complex.

Common Error: "The number of students are increasing."
Correct: "The number of students is increasing."

Pay attention to singular subjects that might seem plural. Words like "everyone," "somebody," and "each" are singular and require singular verbs.

2. Incorrect Use of Articles

Articles (a, an, the) can be tricky, especially for speakers whose native languages don't use them. Using articles incorrectly can make your speech sound unnatural.

Common Error: "I went to library yesterday."
Correct: "I went to the library yesterday."

Remember to use "the" for specific things and "a/an" for general things. Don't use articles with plural or uncountable nouns when speaking generally.

3. Mixing Up Tenses

Switching between past, present, and future tenses inappropriately is a common issue. This often happens when describing past events or telling stories.

Common Error: "Yesterday I go to the market and buy some vegetables."
Correct: "Yesterday I went to the market and bought some vegetables."

Practice maintaining consistent tenses when telling stories or describing sequences of events. Use transition words to signal time changes.

4. Incorrect Modal Verb Usage

Modal verbs (can, could, should, would, must) are powerful but often misused. Students frequently make errors with their form and meaning.

Common Error: "I can to swim very well."
Correct: "I can swim very well."

Remember that modal verbs are followed by the base form of the verb without "to." Also, be careful with their meanings – "should" is different from "must."

5. Confusing Comparative and Superlative Forms

Comparing things is common in IELTS Speaking, but students often make mistakes with comparative and superlative adjectives.

Common Error: "My city is more bigger than yours."
Correct: "My city is bigger than yours." or "My city is much bigger than yours."

Don't use "more" with "-er" endings. For short adjectives, add "-er" for comparatives and "-est" for superlatives. Use "more/most" only with longer adjectives.

How to Improve Your Grammar

The key to avoiding these errors is regular practice and self-awareness. Record yourself speaking and listen for these common mistakes. Practice with sample IELTS questions and focus on accuracy, not just fluency.

At KS Institute, we help students identify their specific grammar weaknesses and provide targeted practice to eliminate these errors permanently.

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