Here's the thing. Subject-verb agreement seems simple until it isn't. I've sat with students who score band 7 on everything else but drop to band 6.5 on Grammatical Range and Accuracy because of one mistake they keep making: they forget that the subject of the sentence, not the words closest to the verb, determines whether that verb is singular or plural.
Let me be blunt. This single error costs IELTS test-takers about 0.5 band points on average. That might not sound like much until you realize you're aiming for band 7 overall. Band 7 requires grammatical accuracy in complex structures. Band 6.5 doesn't. The difference? Subject-verb agreement in those complex sentences.
I've corrected thousands of essays. The same patterns show up over and over. And the good news is that once you see the pattern, you stop making the mistake. Let's get into it.
The IELTS band descriptors for Grammatical Range and Accuracy are specific. At band 7, you need "generally accurate spelling and punctuation" with "some errors in complex structures." At band 6, you have "frequent errors in spelling" and your grammar work is "mostly accurate." Notice the word "mostly." That means you get away with a few mistakes.
But here's where it gets real. Subject-verb agreement isn't a spelling mistake. It's not a typo. It's a grammatical error, and examiners notice them immediately. When you write "The majority of students is struggling," an examiner reads that and thinks, "This candidate doesn't understand basic grammar rules." They're not wrong to think that. You don't. Not yet, anyway.
The examiner won't give you the benefit of the doubt. They mark it as an error in grammatical accuracy. One error doesn't tank your score. But three or four of them in a 250-word essay? That's the difference between band 6.5 and band 7.
This is where most students mess up when tackling IELTS grammar mistakes. You identify the subject correctly. You know the verb. But then 5, 10, sometimes 15 words come between them, and your brain gets confused about which word the verb should agree with.
Read this example:
Weak: "The impact of climate change on developing countries are significant."
The subject is "impact" (singular). The verb should be "is," not "are." The phrase "of climate change on developing countries" is descriptive. It's not the subject. But your ear hears all the plural stuff and wants "are." That's the trap.
Good: "The impact of climate change on developing countries is significant."
Here's a technique I teach: cross out the prepositional phrases. Remove everything between the subject and verb. "The impact is significant." Now it's obvious. Do this on test day. Literally draw lines through the words that don't matter.
Tip: Ask yourself: "What is doing the action?" That's your subject. Ignore everything after "of," "with," "in," "on," and "by" until you hit the verb. Those prepositional phrases never affect verb agreement.
American English and British English actually disagree here. This creates real problems for IELTS candidates, especially those taking the test in the UK or Australia.
Collective nouns refer to groups: team, family, committee, government, staff, audience, jury, couple. The question is: are they singular or plural?
In British English, which IELTS uses, collective nouns can go either way depending on context. If you're talking about the group as a single unit, it's singular. If you're emphasizing the individuals within the group, it's plural.
Good: "The team is ready to compete" (group as one unit).
Also good: "The team are divided on this issue" (individuals within the group).
My advice? Stick with singular for most collective nouns in your IELTS writing. It's safer. You won't make mistakes, and it sounds natural in formal academic writing. Use plural only when the meaning is absolutely clear.
Tip: If you're unsure, rewrite the sentence. Instead of "The committee are debating," write "Committee members are debating." You've removed the problem entirely.
Some nouns look plural but are actually singular. Data. Media. Criteria. Phenomena. These are the ones that get you.
Data is probably the worst offender. In modern English, especially in casual writing, people treat "data" as singular all the time. "The data is clear." But technically, "data" is the plural of "datum." The singular form is rare in conversation, but it exists.
Here's what I tell my students: in formal IELTS academic writing, treat these words as plural.
Weak: "The data suggests that social media use has increased."
Good: "The data suggest that social media use has increased."
It sounds weird. I know. But you're writing for an IELTS examiner who knows grammar rules. They'll mark "data suggests" as technically incorrect. Why take the risk?
Economics. Mathematics. Physics. Politics. These subjects end in "s" but are singular. You use a singular verb.
Weak: "Politics are complicated in developing nations."
Good: "Politics is complicated in developing nations."
Then there are words like "economics" when they describe a plural object. "The economics of those policies are complex." Here "economics" describes multiple policies, so you can use "are." But honestly, this is getting into edge cases. Stick with singular for these words in your own writing.
Now the opposite: words that look singular but are plural. Scissors. Glasses. Trousers. Pants. You need a plural verb.
Weak: "The scissors is in the drawer."
Good: "The scissors are in the drawer."
With "the news," both singular and plural are acceptable in modern English. It's idiomatic. But for scissors, pants, and trousers, always use the plural verb.
These constructions trip people up because the rule isn't what you think. It's not "always plural" or "always singular." It depends on what's nearest to the verb.
Good: "Either the government or the businesses are responsible" (businesses is plural, so verb is plural).
Good: "Either the business or the governments are responsible" (governments is plural, so verb is plural).
Good: "Either the business or the government is responsible" (government is singular, so verb is singular).
The rule: the subject nearest to the verb controls agreement. This applies to "neither/nor," "not only/but also," and "or" constructions.
Tip: To avoid this complication, rearrange your sentence. Instead of "Either students or the teacher is..." write "Either the teacher or students are..." Put the plural part last. You'll use the plural verb anyway, so it sounds more natural.
Words like "all," "some," "most," and "none" can be singular or plural depending on what they refer to. This is genuinely tricky because there's no visual cue telling you which one it is.
The rule is simple: look at the noun that follows the quantifier. That noun determines agreement.
Good: "Most of the population supports this policy" (population is singular).
Good: "Most of the citizens support this policy" (citizens is plural).
Same quantifier, different verb. The noun that comes after "of" is what matters.
Weak: "All of the research support renewable energy" (research is singular).
Good: "All of the research supports renewable energy."
In IELTS Task 1 writing, you'll constantly use quantifiers when describing data and statistics. Get them right, and examiners notice immediately.
Don't just do grammar exercises. That's boring and doesn't transfer to real writing. Instead, do this:
This takes 15 minutes per essay. Do it three times. You'll develop an intuition for what's right and wrong.
Better yet, use our free essay grading tool. It flags subject-verb agreement errors and explains exactly why they're wrong, so you get instant feedback on patterns you're missing.
Subject-verb agreement becomes even more critical in advanced structures. When you use relative clauses or conditional sentences, the subject of the main clause might differ from the subject of the dependent clause. That's where errors creep in.
For example: "The policies, which the government implements, are designed to help citizens." Here, the main subject is "policies" (plural), so "are" is correct, even though "government" appears closer to the verb in the middle of the sentence.
The key is identifying where the main clause ends and where your dependent clause begins. Once you do that, agreement becomes straightforward again.
You might think: "I'll just avoid these complicated sentences and stick to simple structures." That won't work in IELTS. The band descriptors explicitly reward complex structures. Band 7 and above require you to use them. But you have to use them correctly. One subject-verb agreement error in a complex sentence stands out more than the same error in a simple one. An examiner reads "The team are divided" in a simple sentence and might let it slide. But if you use that same error in a sophisticated sentence, it signals that you don't actually control the structure you're trying to use. Avoid that trap by mastering agreement now.
Subject-verb agreement means the verb in a sentence must match the subject in number (singular or plural). In IELTS, examiners assess grammatical accuracy closely. A single recurring agreement error can cost you 0.5 band points on the Grammatical Range and Accuracy criterion, which is the difference between band 6.5 and band 7. Master this rule to control complex sentences and signal to examiners that you understand advanced grammar structures.