Subject / verb agreement mistakes: 7 things to bear in mind.

First things first: What is subject / verb agreement?

It’s a grammatical rule that states that the verb must agree in number with its subject. In English, present tense verbs change to show agreement in the third person singular form by adding an S (or ES). Seems fairly straightforward, doesn’t it? So how could it be that students of all levels, nationalities and age groups seem to get this wrong far more often than would seem reasonable? It’s just another letter at the end of the verb, for heaven’s sake!

Today, 23 years after my very first lesson in 1990, hard as it still is to hear an intermediate student say “he don’t likes” without wincing internally, I think I am finally beginning to come to terms with students’ subject / verb agreement mistakes and learning to accept them as a natural part of their language development. This post is meant to help you take a slightly broader view of
subject / verb agreement mistakes rather than automatically dismiss them as “things students shouldn’t be saying at that level.”

The thing that strikes me most about subject / verb agreement mistakes is how ubiquitous they seem to be. To many teachers’ despair, a sentence like “My brother study English”, which we would expect – and welcome – from an A1 student, typically persists way beyond that, into A2, B1 and possibly B2+, depending on the learner and on the circumstances. Why does that happen? A number of studies have shown that students acquire L2 morphemes in a fairly predictable fashion, regardless of language background, age and – here’s the bombshell – what they learn in class. It so happens that the third person S is internalized relatively late – after ing, auxiliary be, articles and irregular past forms. No amount of awareness raising, drilling and corrective feedback seems to significantly alter this sequence. But things are more complicated than they might appear.

1. There will be instances, of course, where your students will get subject / verb agreement right, too, although still inconsistently. Typically, most students up until B1ish will shift back and forth between accurate use and omission of the third person S, rather than produce a steady stream of either deviant or correct forms. What’s rarely discussed, unfortunately, is how accuracy also seems to depend on the verb at hand. Have you ever noticed, for example, how students seem to get certain verbs right more often than others? “He likes”, “She plays” and “Bob lives” are – at least in my experience – much more likely to be conjugated correctly than, say, “He sees”, “She goes” or “Lucy watches.”

True, this sort of backsliding is inherent to language acquisition – it’s evidence that students are mapping out their own internal grammars, as it were. In this particular case, though, I suspect students are also operating lexically / intuitively. Maybe – and I say maybe – certain verbs create a phonetic environment that makes them sound more “third person-friendly” than others. This means that if you want to assess the extent to which your students have truly internalized subject / verb agreement rules, you must test how consistently they’re getting the third person S right in spontaneous communication, across a range of verbs. Isolated instances probably won’t tell you much.

2. I believe we ought to help students gradually move from lexical, intuitive and often erratic use of the third person S towards a more conscious and systematic mapping and deployment of the underlying systems. Here’s a rule of thumb: If your student makes a subject / verb agreement mistake, don’t automatically
assume that it’s simply a performance breakdown at the surface level
– a slip, if you will. True, “He like soccer”, “She have a car” are probably performance slips beyond A1. But there might – and I say might – be more than meets the eye to (a) “My friends likes”, (b) “Everybody know” and (c) “She always play.” Let me talk about each case in turn.

When clarifying or eliciting subject / verb agreement rules, we tend to emphasize the use of the third person S after the pronouns he, she, it. However, subject-verb agreement usually causes more problems when the subject of the verb is a noun. Yet, for some reason, we tend to assume that during spontaneous communication, most students will
operate grammatically and automatically connect all the dots (Tom = he, Tom and Jerry = they) as they go along. What if they don’t? What if we actually need to spell things out, even at B1ish?

4. Also, if the noun ends with S (whether or not it’s a plural form), it might end up being even more troublesome partly because of the issues I addressed in item 1. For example, if I close my eyes now, I can hear far more students saying “My parents lives” rather than “They lives” and maybe more students saying “My boss knows” rather than “My supervisor knows.” My tentative hypothesis here is that maybe the first S somehow attracts a second one, which might make processing harder, even if the student knows the relevant morphology.

5. Quantifiers, indefinite pronouns and irregular plural forms are tricky, too, and mistakes in those areas are more likely to be misrepresentations of the rule than simply performance breakdowns. Chances are that in the past month or so you’ve had to remind students
that “everybody” needs a verb in the third person singular, while “people”, for example, doesn’t. I for one lost count of the number of times I’ve repeated that rule, often to little or no avail. In hindsight, though, I wish I hadn’t used the terms “third person singular” and “plural”, which might have confused students even more. After all, from their perspective, to all intents and purposes:

Singular = no S
Plural = add an S

Student: Everybody in my family like him.
Me: Third person singular, remember?
Maybe student will think: That’s what I said. Like! No S.

Or even worse:

Student: People likes him.
Me: Remember – people is plural.
Maybe student will think: That’s what I said – likeS.

So here’s my advice: Steer clear of “singular” and “plural:”

Student: People likes him.
You: People = they.
Student: Oh, ok. People like him.

6. When there’s an adverb between the subject and the verb, some students seem to think that the adverb somehow alters the rules: He never go. / My mom really like chocolate. Again, it’s hard to tell whether or not they’re operating intuitively (“He always goes sounds odd!”), so the most sensible thing to do might be to explain / remind them that the adverb makes no difference.  In the same way, I don’t think we can automatically assume that subject / verb agreement rules will cross over into other structures naturally. For example, when presenting and practicing the so-called first conditional, it’s probably a good idea to remind students that we should say “If he goes…” rather than “if he go…”. Simply telling them to use the simple present in the if clause just won’t cut it. At least not in my experience.

7. For better and for worse, subject / verb agreement mistakes hardly ever impede communication. This means that if you’re a teacher who tends to prioritize mistakes that hinder comprehension, you’ll tend to overlook subject / verb agreement mistakes in speaking because, after all, the student was able to convey the message. I personally take the view, however, that we ought to provide more rather than less corrective feedback in this case, especially after A2.

The key, perhaps, is to understand what correction can and cannot do. Corrective feedback will rarely take care of subject / verb agreement mistakes that students aren’t developmentally ready to eliminate. It will, however:
a. Help to clarify a rule that perhaps was misunderstood or only partially learned. Remember: We can’t assume that most subject / verb agreement mistakes are merely performance slips.
b. Make students more sensitive to subject / verb agreement in the input that surrounds them. The more they notice and re-notice the third person S outside the classroom, the more likely they are to restructure their interlanguage.
c. Encourage students to monitor their speech, which might contribute to long-term overall

Thanks for reading.

19 thoughts on “Subject / verb agreement mistakes: 7 things to bear in mind.”

  1. Márcia Helena Rugai Bresciani says:

    Hello, Luiz Otávio!
    I would like to know if you teach private classes. My sister was a student of yours at Alumni and made an excellent reccomendation of you.
    I really like your page!

    1. Luiz Otávio says:

      Hi, Marcia
      Are you Marisa’s sister?
      Welcome to the page and thank you for your kind words.
      I’m not teaching these days, I’m afraid.
      Best wishes,

  2. A really interesting and thoughtful post, with lots of good points. I had never thought about it before, but I think you’re right about one ‘s’ leading to another- perhaps because -s is how we signal plural as well as third person?
    I also agree with you about correction at higher levels helping students to notice and re-formulate. A former colleague of mine had a great technique. he would draw an ‘S’ on his palm and just flash it at the learners when they made a 3rd person -s slip. This had the effect of alerting them to the mistake, without breaking the flow of what they were saying.

    1. Luiz Otávio says:

      Thank you for your kind words.
      Love the technique, though part of me (you know, the part that believes in Murphy’s Law a little more than he should) fears that if we go overboard, we might end up with “He cans.” But, still, the pros outweigh the cons.
      As to the “s”, yeah, I think you’re right. When we think they’re operating mostly grammatically, phonotactics comes into play… Assuming my pseudo-theory makes any sense, of course.

  3. mohammed el brahmi says:

    coherent writing can never fulfill its good conditions without subject-verb agreement.

    1. Luiz Otávio says:

      Hi, Mohammed
      You’re right – poor subject / verb agreement impacts writing much more seriously. I still think, though, that you might make lots of s/v agreement mistakes and YET end up with a coherent piece of writing – good logic, sound arguments, nice flow. The overall readability, though, is hampered by s/v agreement mistakes.
      At any rate, this post is concerned primarily with speaking, which, in hindsight, is a point I should’ve made at the outset of the post.
      Thanks for stopping by!

  4. Thanks for this post. It’s quite helpful to know perhaps why one of my lower level Chinese students doesn’t get this area as easily as I want him to! Your post has highlighted to me that sometimes this area (or any grammatical area) is easier than we teachers think it is!

    1. Luiz Otávio says:

      Thank you, Jonathan, for your comments. It’s important to remind ourselves, I think, that subject/verb agreement mistakes are mostly developmental in nature and, therefore, not language specific. So the problems you’ve described most likely apply to teachers and students worldwide.
      By the way, are you Jonathan Alderman?

        1. Luiz Otávio says:

          Real nice guy I met last year!

  5. Great post! I’m a native speaker teaching ESL student in Argentina. There’s something that has been bothering me and maybe you can help me. The thing is, many, many of my students make the same mistake. The use certain verbs without an accompanying subject, especially at the beggining of sentences. This construction is very common in spanish. The verb to be looks like the most problematic, but it happens with to her verbs too. For example “How was the party?” “Was good” or “Is rainy today”, “i went to the bar. Had a coffee” “Went to the movies the other day”.
    Is there some kind of organic explanation or rule i can teach for this which can show students when and when not it’s okay to talk like this? I point it out every time, but then there are cases where the absence of a pronoun or subject isn’t wrong and student get confused. Thank you!

    1. Luiz Otávio says:

      Brazilian students make the very same mistake.
      There’s no miracle cure, I think, so I try a mix of:
      1. L1 vs. L2 contrast: I show students why they’re getting it wrong and contrast English and Portuguese. I think that (awareness) is the very first step.
      2. Systematic on-the-spot correction. On the spot, though, doesn’t mean mid-sentence – I wait for students to finish the sentence.
      3. Patience: Some errors do take a little longer to disappear…

  6. *students *other *students Lol 😛

  7. Hello Luiz,

    I recently met a student (A2) whose vocabulary is fairly large for his level, but he’ll make some really elementary tense errors, mixing up present simple and simple past. But he doesn’t make these errors consistently. It might be “backsliding”, he speaks in rapid, loud bursts in class. He wants to speak, but he isn’t comfortable speaking.

    Would you recommend any published activities/resources I could use?

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  9. I’m trying to decide how and whether to explain such errors to the parents of a student in my class. I know the children were born in the US and the parents were not. Although they claim English is spoken at home, I suspect that the children usually hear the parents speak in their first language. Your thoughts?

  10. GREAT post. I feel the same frustration with my students! I liked your suggestions and I’m trying to develop some exercises for them to do in order to practice this. I was thinking of creating some fill in the blank, matching and I wonder if reading aloud would help? For example, reading “The parents know about the daughter’s boyfriend.” Having them actually say it, see it and then have to write about it. Thoughts? Thanks again.

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