The difference between 'am,' 'is,' and 'are' depends on the subject of the sentence. They are all present tense forms of the verb 'to be.' Use 'am' with 'I,' use 'is' with singular subjects (he, she, it), and use 'are' with 'you' and plural subjects (we, they).
Navigating the basics of English grammar can feel tricky, but some rules are simpler than they seem. A common point of confusion for learners is knowing when to use 'am,' 'is,' or 'are.' Getting these three little words right is a fundamental step toward sounding fluent and natural. In this guide, we'll break down the exact difference between 'am,' 'is,' and 'are,' providing clear rules and simple example sentences to build your confidence.
What are 'am,' 'is,' and 'are' anyway?
Before diving into the rules, it's helpful to know what these words are. 'Am,' 'is,' and 'are' are the three present tense conjugations of the verb 'to be.' The verb 'to be' is one of the most important verbs in English, used to describe states of being, identity, location, and characteristics.
The key to using them correctly is a concept called subject-verb agreement. This just means the verb you choose must match the subject of your sentence. Let's look at each one individually.
When should I use 'am'?
The rule for 'am' is the easiest one to remember because it has only one job.
Rule: Use 'am' only with the first-person singular pronoun, 'I.'
If you are talking about yourself in the present, 'am' is your word. You will never use 'am' with any other subject.
Examples of using 'am'
- I am a teacher.
- I am happy to help you.
- I am feeling tired today.
- I am not ready to leave.
When should I use 'is'?
'Is' is used when you are talking about a single person, place, thing, or idea in the third person.
Rule: Use 'is' with third-person singular subjects. This includes the pronouns 'he,' 'she,' and 'it,' as well as any singular noun.
Think of it this way: if you can replace the subject with 'he,' 'she,' or 'it,' you should use 'is.'
Examples of using 'is'
- He is my brother.
- She is from South Korea.
- It is a beautiful day.
- The dog is sleeping on the couch. (The dog = it)
- Maria is an excellent student. (Maria = she)
When should I use 'are'?
'Are' covers the most ground. It's used for the second person ('you') and all plural subjects.
Rule: Use 'are' with the pronoun 'you,' the first-person plural 'we,' the third-person plural 'they,' and any plural noun.
An important note: In English, 'you' always takes 'are,' even if you are talking to only one person. It is treated grammatically as a plural.
Examples of using 'are'
- You are my best friend.
- We are going to the park.
- They are very talented musicians.
- The cats are hungry. (The cats = they)
- My parents are arriving soon. (My parents = they)
Understanding the difference between 'am,' 'is,' and 'are' in a table
Sometimes, seeing it all laid out helps the rules stick. Here’s a quick reference table for subject-verb agreement with the verb 'to be.'
| Subject/Pronoun | Verb Form | Example Sentence | |-----------------|-----------|--------------------------------| | I | am | I am learning. | | You | are | You are next. | | He / She / It | is | She is a doctor. | | We | are | We are a team. | | They | are | They are at home. | | Singular Noun | is | The book is on the table. | | Plural Noun | are | The books are on the table.|
How do you use 'am,' 'is,' and 'are' in questions and negatives?
Once you know which verb to use, forming questions and negative statements is simple.
- For questions: Move 'am,' 'is,' or 'are' to the beginning of the sentence, before the subject.
- For negatives: Add the word 'not' after 'am,' 'is,' or 'are.' You can also use the common contractions 'isn't' (is not) and 'aren't' (are not).
Here are some examples:
- Statement: She is a writer.
- Question: Is she a writer?
- Negative: She is not (isn't) a writer.
- Statement: They are ready.
- Question: Are they ready?
- Negative: They are not (aren't) ready.
- Statement: I am late.
- Question: Am I late?
- Negative: I am not late. (Note: 'amn't' is not used in standard English.)
Conclusion
Mastering the difference between 'am,' 'is,' and 'are' is a huge step toward speaking and writing English correctly. The rule is all about subject-verb agreement: 'I' pairs with 'am,' singular subjects like 'he,' 'she,' and 'it' pair with 'is,' and plural subjects like 'we' and 'they'—along with 'you'—pair with 'are.' With a little practice, choosing the right form of the verb 'to be' will become second nature.
***
Frequently Asked Questions (FAQ)
What is the main difference between am, is, and are? The main difference is the subject they are used with. 'Am' is exclusively for the subject 'I.' 'Is' is for singular third-person subjects (like he, she, it, a book). 'Are' is for the subject 'you' and all plural subjects (like we, they, the books).
Why do we use 'are' with 'you' even for one person? This is a rule of modern English grammar. Historically, English had a different pronoun for a single 'you' ('thou'), but that is no longer used. Today, 'you' is treated as a plural for verb conjugation purposes, so it always pairs with 'are,' regardless of whether you're speaking to one person or a group.
Can I ever use 'is' with 'I'? No, you cannot. In standard English grammar, the subject 'I' is always paired with 'am' in the present tense. Saying "I is" is a common mistake for learners but is grammatically incorrect.
What is the past tense of am, is, and are? The verb 'to be' has two past tense forms. 'Was' is the past tense of 'am' and 'is' (used with I, he, she, it). 'Were' is the past tense of 'are' (used with you, we, they).
Are the words 'isn't' and 'aren't' formal or informal? 'Isn't' (is not) and 'aren't' (are not) are contractions. They are very common in spoken English and informal writing (like emails to friends). In formal academic or business writing, it is generally better to write the full words, 'is not' and 'are not.'