Matching Subjects and Verbs: The 'S' Rule (Subject-Verb Agreement)
Grammar Rule in 30 Seconds
In the Present Simple, always add an 's' to the verb when the subject is He, She, or It.
- Add -s for most verbs: 'He works' (max 20 words)
- Add -es for verbs ending in -ch, -sh, -x, -z, or -s: 'She watches'
- Change -y to -ies if a consonant comes before it: 'It flies'
Overview
In English, we add -s to some action words.
This rule helps you speak well. Use it for daily things.
Conjugation Table
| Subject | Verb Form (Present Simple) | Example Sentence | ||
|---|---|---|---|---|
| :------------- | :------------------------- | :-------------------------------------- | ||
I |
speak |
I speak English. |
||
You (singular) |
speak |
You speak quickly. |
||
He |
speaks |
He speaks three languages. |
||
She |
speaks |
She speaks to her friend. |
||
It |
speaks |
The machine speaks a loud warning. |
||
We |
speak |
We speak during the meeting. |
||
You (plural) |
speak |
You all speak clearly. |
||
They |
speak |
They speak about their plans. |
How This Grammar Works
Formation Pattern
General Rule: Add -s
For most verbs, simply add -s to the base form when the subject is he, she, or it.
work→workse.g.,He works hard.play→playse.g.,She plays tennis.eat→eatse.g.,It eats slowly.
Special Spelling Rules: Add -es (and variations)
When adding -s alone is not enough, the spelling adjusts. Four patterns all belong here:
Ending in -s, -ss, -sh, -ch, -x, -z → Add -es
Adding only -s would be hard to pronounce, so -es adds an extra syllable for clarity.
pass→passese.g.,He passes the ball.watch→watchese.g.,She watches TV.fix→fixese.g.,It fixes the problem.
Ending in consonant + -y → Change -y to -i, add -es
When a consonant comes before -y, drop the -y and add -ies.
study→studiese.g.,He studies English.try→triese.g.,She tries her best.
Ending in vowel + -y → Just add -s
When a vowel (a, e, i, o, u) comes before -y, the -y stays — simply add -s.
play→playse.g.,He plays guitar.enjoy→enjoyse.g.,She enjoys reading.
Ending in -o → Add -es
Common verbs go and do always take -es — learn these as fixed forms.
go→goese.g.,She goes to school.do→doese.g.,He does his homework.
do becomes does (like He does his homework. )
-s alone would not work, English adjusts the spelling to keep pronunciation clear.
When To Use It
My brother wakes up at 7 AM every day.(My brotheris singular, equivalent tohe.)She always drinks coffee in the morning.The train leaves on time from platform 3.
The sun rises in the east and sets in the west.(The sunis a singularit.)Water freezes at 0 degrees Celsius.A cat has nine lives, according to the proverb.(Note the irregular verbto haveuseshasfor singular subjects.)
My friend lives in London and works as a teacher.(My friendis singular, equivalent toheorshe.)This car has excellent fuel economy and costs a lot.The library opens at 9 AM and closes at 6 PM.
When Not To Use It
I, You (one or many), We, or TheyI like pizza.(Incorrect:I likes pizza.✗)You understand the lesson.(Incorrect:You understands the lesson.✗)We go to the park every weekend.(Incorrect:We goes to the park.✗)
My friends play soccer on Sundays.(Incorrect:My friends plays soccer.✗)The students study hard for their exams.(Incorrect:The students studies hard.✗)Dogs bark loudly at strangers.(Incorrect:Dogs barks loudly.✗)
He doesn't like coffee.(doesalready shows the singular agreement;likeis in its base form.) (Incorrect:He doesn't likes coffee.✗)She does not watch TV very often.(Incorrect:She does not watches TV.✗)They don't understand the instructions.(Incorrect:They doesn't understand.✗)
do/does)Does she live in London?(Doesshows agreement;liveis in its base form.) (Incorrect:Does she lives in London.✗)Do they speak English?(Incorrect:Does they speak English.✗)Does he play guitar?(Incorrect:Does he plays guitar.✗)
She can swim very well.(Incorrect:She can swims very well.✗)He should study more for the test.(Incorrect:He should studies more.✗)It must be late now.(Incorrect:It must is late now.✗)
Common Mistakes
-s for he, she, it- Incorrect:
My sister live in Paris.✗ - Correct:
My sister lives in Paris.✓ (My sisteris singular, equivalent toshe.) - Incorrect:
The cat eat fish every day.✗ - Correct:
The cat eats fish every day.✓
-s for I, You, or many things2. Negative Contractions (Third Person)
| Full Form | Contraction | Usage Note |
|---|---|---|
|
He does not
|
He doesn't
|
Most common in speech
|
|
She does not
|
She doesn't
|
Most common in speech
|
|
It does not
|
It doesn't
|
Most common in speech
|
Present Simple Conjugation: 'To Work'
| Subject | Verb Form | Example |
|---|---|---|
|
I
|
Base Form
|
I work
|
|
You
|
Base Form
|
You work
|
|
He
|
Base + S
|
He works
|
|
She
|
Base + S
|
She works
|
|
It
|
Base + S
|
It works
|
|
We
|
Base Form
|
We work
|
|
They
|
Base Form
|
They work
|
Meanings
The rule requiring the addition of a suffix (-s, -es, or -ies) to a base verb when the subject is in the third-person singular (He, She, It, or a single name/object) in the present tense.
Standard Agreement
Adding a simple 's' to the majority of English verbs to match a singular subject.
“He plays the guitar every evening.”
“She lives in a small apartment.”
Phonetic Spelling Adjustment
Adding '-es' instead of '-s' when a verb ends in sounds that would be hard to pronounce with just an 's' (like 'sh' or 'ch').
“He washes his car on Sundays.”
“She teaches mathematics at the local school.”
Consonant-Y Transformation
Changing the 'y' to 'i' and adding 'es' when the verb ends in a consonant followed by 'y'.
“The baby cries when he is hungry.”
“She studies hard for her exams.”
Reference Table
| Form | Structure | Example |
|---|---|---|
|
Affirmative
|
Subject + Verb(s/es)
|
He speaks Spanish.
|
|
Negative
|
Subject + doesn't + Verb (base)
|
She doesn't speak Spanish.
|
|
Question
|
Does + Subject + Verb (base)?
|
Does it work?
|
|
Short Answer (+)
|
Yes, Subject + does
|
Yes, he does.
|
|
Short Answer (-)
|
No, Subject + doesn't
|
No, she doesn't.
|
|
Spelling (-es)
|
Verbs ending in -ch, -sh, -x, -s
|
He watches movies.
|
|
Spelling (-ies)
|
Consonant + y → ies
|
The bird flies.
|
|
Irregular
|
Have → Has
|
She has a dog.
|
Formality Spectrum
He serves as the Chief Executive Officer. (Professional introduction)
He works as a manager. (Professional introduction)
He's a manager. (Professional introduction)
He runs the show. (Professional introduction)
The 'S' Club Members
Pronouns
- He Male person
- She Female person
- It Object/Animal
Singular Nouns
- My friend One person
- The car One thing
I/You/We/They vs. He/She/It
Should I add an 'S'?
Is the subject He, She, It, or 1 person/thing?
Is it a negative or a question?
Spelling Rules for the 'S'
Just add S
- • works
- • plays
- • eats
Add ES
- • watches
- • washes
- • fixes
Change to IES
- • studies
- • cries
- • flies
Examples by Level
He drinks milk every morning.
She speaks English very well.
It rains a lot in London.
My cat likes fish.
He doesn't watch TV at night.
Does she study at the library?
The bus finishes its route here.
He has a new smartphone.
Everyone knows that the earth goes around the sun.
Nobody wants to work on Saturdays.
She tries to exercise at least three times a week.
The news starts at eight o'clock.
Neither of my brothers lives in this city.
The government proposes a new tax on sugar.
The data suggests that prices are rising.
Does anyone know where the manager is?
The complexity of the issues requires a detailed analysis.
Physics deals with the fundamental laws of nature.
Every man and woman has the right to vote.
The jury reaches a verdict after hours of deliberation.
The sheer number of variables involved complicates the process.
Politics is often described as the art of the possible.
If anyone calls, tell them I'm busy.
The United States maintains a strong presence in the region.
Easily Confused
Both use an 's' at the end, but for opposite reasons.
Learners often say 'He playing' instead of 'He plays' or 'He is playing'.
Learners want to keep the 's' when 'does' is present.
Common Mistakes
He go to school.
He goes to school.
She like coffee.
She likes coffee.
It work well.
It works well.
My father drive a car.
My father drives a car.
Does he likes pizza?
Does he like pizza?
She doesn't plays tennis.
She doesn't play tennis.
He haves a dog.
He has a dog.
Everyone have a phone.
Everyone has a phone.
The news are bad.
The news is bad.
Neither of them know the answer.
Neither of them knows the answer.
The criteria for the award is strict.
The criteria for the award are strict.
Sentence Patterns
[Name] ___ [Activity] every day.
She doesn't ___ because she ___.
It ___ like a good idea, but it ___ a lot of work.
Neither of them ___ to ___ that he ___.
Real World Usage
He says he's coming at 8.
My current manager relies on my reports.
She looks so happy in this photo!
My friend wants the burger, but he doesn't like onions.
The GPS says to turn left here.
The earth rotates on its axis.
The 'Does' Magnet
The 'Has' Trap
Listen for the Buzz
Singular 'They'
Smart Tips
Hiss like a snake! Make sure you hear that 's' or 'z' sound at the end of the action.
Imagine 'does' is a thief that steals the 's' from the main verb.
Find the 'head' noun. Is it one man or many dogs? The verb matches the man!
Treat these words like 'It'. They always take an 's'.
Pronunciation
The Three Sounds of 'S'
The 's' ending can sound like /s/, /z/, or /iz/ depending on the last sound of the verb.
Statement Falling Intonation
He works ↘ here.
A standard factual statement.
Memorize It
Mnemonic
He, She, It... the 'S' must fit!
Visual Association
Imagine the letter 'S' is a tail that only grows on a verb when a single person (He/She) or a single thing (It) is standing in front of it.
Rhyme
I walk, you walk, we walk too. But He walks, She walks—that's what they do!
Story
In the Kingdom of Grammar, the 'S' is a special crown. Only the three royals—Prince He, Princess She, and the Royal Pet It—are allowed to wear the 'S' crown on their actions. If anyone else tries to wear it, the Grammar Police will stop them!
Word Web
Challenge
Look around the room. Find one person or one object. Say three things they are doing or three facts about them using the 'S' rule. (e.g., 'The lamp sits on the table. It looks bright. It costs ten dollars.')
Cultural Notes
In the UK, collective nouns like 'the team' or 'the government' often take a plural verb ('The team are playing well'), whereas in American English, they almost always take a singular verb ('The team is playing well').
In AAVE, the third-person 's' is often omitted as part of the dialect's systematic grammar ('He go to the store'). This is a valid dialectal variation, not a 'mistake' within that context.
In 'International English' or 'ELF' (English as a Lingua Franca), the third-person 's' is often dropped by non-native speakers. While understood, it is still corrected in formal business writing.
The '-s' ending comes from the Northumbrian dialect of Old English, where it was '-es'.
Conversation Starters
What does your best friend do for fun?
How does your favorite app work?
What happens if it rains on your wedding day?
How does your government handle environmental issues?
Journal Prompts
Common Mistakes
Test Yourself
My brother ___ in London.
She ___ (watch) movies every Friday.
Find and fix the mistake:
He don't like apples.
always / she / her / finishes / work
Match each item on the left with its pair on the right:
Select the grammatically correct question.
The sun ___ (rise) in the east.
Find and fix the mistake:
The baby crys a lot.
Score: /8
Practice Exercises
8 exercisesMy brother ___ in London.
She ___ (watch) movies every Friday.
Find and fix the mistake:
He don't like apples.
always / she / her / finishes / work
1. I, 2. He, 3. They, 4. It
Select the grammatically correct question.
The sun ___ (rise) in the east.
Find and fix the mistake:
The baby crys a lot.
Score: /8
Practice Bank
12 exercisesThe student always ___ their homework.
We ___ to the beach every summer.
My friends often plays soccer in the park.
The sun rise in the east.
Choose the correct sentence:
Choose the correct sentence:
Translate into English: 'She writes a letter.'
Translate into English: 'My dog barks loudly.'
Arrange these words into a sentence:
Arrange these words into a sentence:
Match the subjects with the correct verb form for 'to eat'.
Match the subjects with the correct verb form for 'to live'.
Score: /12
FAQ (8)
It's a historical leftover from Old English. Most other person-endings disappeared over time, but the third-person singular 's' survived. It helps distinguish the subject in a sentence.
No. Even if 'they' refers to a single person (singular they), it always takes the plural verb form: `They work here`, not `They works here`.
It is always `goes`. Verbs ending in '-o' like `go` and `do` require `-es`.
These are singular! You should say `Everyone likes pizza` and `Somebody knows the truth`.
English grammar doesn't like 'double marking'. Since the 's' is already on `does`, the main verb `like` doesn't need it. Think of `does` as the boss who takes the 's' for himself.
For the 's' rule, `has` is the main irregular verb. The verb `to be` is also irregular (`is`), but it's usually taught as its own rule.
No! In the past tense, the verb is the same for everyone: `I worked`, `He worked`, `They worked`. The 's' rule is only for the `Present Simple`.
Then the subject is 'They' (plural), so you do NOT add an 's'. `John and Mary work here`.
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
Presente de Indicativo (-a/-e)
Spanish changes the verb for every person; English only for the third person singular.
Présent de l'indicatif
English 's' is always pronounced, whereas French endings are often silent.
Präsens (-t)
German also has distinct endings for 'we' and 'you plural', which English does not.
Dictionary form (u-verb/ru-verb)
Japanese has zero person-based conjugation.
Al-Mudaari' (Present Tense)
Arabic distinguishes between 'he' and 'she' in the verb form; English uses 's' for both.
No conjugation
Chinese relies on context and time markers rather than verb endings.
Learning Path
Prerequisites
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