El Verbo 'Ser' o 'Estar' (am, is, are)
am, is, are para construir frases básicas en inglés con confianza sobre todo.
Grammar Rule in 30 Seconds
The verb 'to be' is the 'glue' of English, connecting a person or thing to a description, name, or location.
- Use `am` only with `I` (e.g., I am happy).
- Use `is` for one person/thing (he, she, it) (e.g., She is a doctor).
- Use `are` for you and groups (you, we, they) (e.g., We are students).
Overview
to be.to be como el pegamento que une tu identidad a tus palabras.I am tired o revisando el estado de tu conductor de Uber, estás usando esta regla. Es el primer paso para sonar como un humano real en inglés.How This Grammar Works
to be en frases cortas. En inglés, nunca lo saltamos. Actúa como un signo de igual (=) en una ecuación matemática.I = happy. You = at home. El verbo to be cambia su forma dependiendo de quién estés hablando.am, is y are. Usas am solo para ti mismo.is para otra persona o cosa. Usas are para grupos o la persona con la que estás hablando. Es como elegir el atuendo adecuado para el clima adecuado.I is suena tan raro como usar botas de nieve en el Sahara. También nos encanta acortar estas palabras cuando hablamos.I am, decimos I'm. Es la versión lingüística de un atajo en un juego de carreras.
Formation Pattern
am con el pronombre I. (La regla del Selfie).
I am a student. (Contracción: I'm)
is con he, she o it. (La regla del Amigo Soltero).
He is tall. (Contracción: He's)
She is hungry. (Contracción: She's)
It is cold. (Contracción: It's)
are con you, we y they. (La regla del Squad).
You are funny. (Contracción: You're)
We are late. (Contracción: We're)
They are outside. (Contracción: They're)
I am a gamer. | Yo soy un gamer. |
You are kind. | Tú eres amable. |
He is a doctor. | Él es doctor. |
She is busy. | Ella está ocupada. |
It is 10 PM. | Son las 10 PM. |
We are ready. | Nosotros estamos listos. |
They are fast. | Ellos son rápidos. |
When To Use It
to be en cinco situaciones principales todos los días.- Identidad: Decirle a alguien tu nombre o trabajo.
I am Alex.She is a developer. - Ubicación: Decir dónde estás en Google Maps.
We are at the cafe.He is in London. - Características: Describir personas o cosas.
The coffee is hot.You are very smart. - Sentimientos: Compartir tu vibra actual.
I am excited!They are bored. - Estados/Edades: Hechos simples sobre la vida.
It is Monday.I am 21 years old.
I am adventurous. I am a dog lover. My dog is very cute. ¿Ves? ¡Ya eres un experto! Solo no lo uses para describir a tu ex a menos que quieras decir He is annoying.
Common Mistakes
Tener: En español, tienes una edad. En inglés, eres una edad. ✗ I have 20 years.
I am 20 years old.
She very pretty.
She is very pretty.
- Confundir
HeyShe: Es común usar la forma incorrecta para los pronombres de género. Recuerda:Hepara chicos,Shepara chicas. Si llamas a tu hermanoshe, podría confundirse, pero al menos tu gramática está bien. - Mezclar
isyare: La gente a menudo diceThey isporque olvidan que es un grupo. Piensa enarecomo el autobús de fiesta plural. - Ortografía de las contracciones: No confundas
You're(tú eres) conYour(tu de posesión). Este es el iniciador definitivo de discusiones en internet. Si lo haces bien, ganas la sección de comentarios de TikTok.
Contrast With Similar Patterns
to be con los verbos de acción. No puedes simplemente pegarlos sin una terminación especial.- To Be vs. Acciones: Puedes decir
I am happy(descripción). Puedes decirI run(acción). Pero no puedes decirI am run. Eso suena como si fueras literalmente una carrera física. Lo cual sería un superpoder muy extraño. - To Be vs. To Have: Como se mencionó, usamos
to bepara sentimientos como el hambre o la sed. ✗I have hunger.→ ✓I am hungry.Usato bepara cosas que describen tu estado de ser, no cosas que posees físicamente. - El factor
It: UsamosIt ispara el clima y la hora. En español dicesHace frío. En inglés,It is cold.¡El clima es su propio personaje!
Quick FAQ
P: ¿Puedo usar am para otras personas?
R: No. am es un verbo egoísta. Solo sale con I.
P: ¿You are es siempre plural?
R: ¡No! Usamos You are para una persona Y para un grupo. Es muy versátil.
P: ¿Por qué usamos contracciones como I'm?
R: ¡Porque somos vagos! Es broma. Hace que la conversación fluya más rápido y suene más natural en entornos informales como WhatsApp.
P: ¿Puedo decir I am being a student?
R: Normalmente, no. I am a student es un hecho estable. I am being implica que estás actuando como un estudiante por un corto tiempo.
P: ¿Está bien usar is para una mascota?
R: ¡Sí! Si la mascota es un chico, usa he. Si es una chica, usa she. Si no lo sabes, usa it.
P: ¿Necesito to be para mi edad?
R: ¡Sí, siempre! Decir I have 25 hará que los angloparlantes piensen que tienes 25 manzanas en tu mochila.
Present Simple Conjugation of 'To Be'
| Subject | Affirmative | Negative | Question |
|---|---|---|---|
|
I
|
am
|
am not
|
Am I?
|
|
You
|
are
|
are not / aren't
|
Are you?
|
|
He
|
is
|
is not / isn't
|
Is he?
|
|
She
|
is
|
is not / isn't
|
Is she?
|
|
It
|
is
|
is not / isn't
|
Is it?
|
|
We
|
are
|
are not / aren't
|
Are we?
|
|
They
|
are
|
are not / aren't
|
Are they?
|
Common Contractions
| Full Form | Contraction | Negative Contraction |
|---|---|---|
|
I am
|
I'm
|
I'm not
|
|
You are
|
You're
|
You aren't / You're not
|
|
He is
|
He's
|
He isn't / He's not
|
|
She is
|
She's
|
She isn't / She's not
|
|
It is
|
It's
|
It isn't / It's not
|
|
We are
|
We're
|
We aren't / We're not
|
|
They are
|
They're
|
They aren't / They're not
|
Meanings
The verb 'to be' describes the state, identity, or quality of a subject rather than an action.
Identity and Names
Used to state who or what someone or something is.
“I am Sarah.”
“This is a book.”
Location
Used to describe where someone or something is situated.
“He is at home.”
“The keys are on the table.”
Feelings and States
Used to describe emotions, physical conditions, or temporary states.
“I am hungry.”
“You are tired.”
Professions
Used to state a person's job or role.
“She is a teacher.”
“They are engineers.”
Age
Used to state how old someone or something is.
“I am twenty years old.”
“He is five.”
Reference Table
| Pronombre Sujeto | Verbo 'to be' | Contracción | Ejemplo |
|---|---|---|---|
|
I
|
am
|
I'm
|
I'm a student.
|
|
You (singular)
|
are
|
You're
|
You're smart.
|
|
He
|
is
|
He's
|
He's my brother.
|
|
She
|
is
|
She's
|
She's happy.
|
|
It
|
is
|
It's
|
It's cold.
|
|
We
|
are
|
We're
|
We're friends.
|
|
You (plural)
|
are
|
You're
|
You're all here.
|
|
They
|
are
|
They're
|
They're busy.
|
Espectro de formalidad
I am prepared to depart. (Leaving a location)
I am ready to go. (Leaving a location)
I'm ready! (Leaving a location)
I'm set. (Leaving a location)
El Universo del 'To Be'
Identificar
- I am a student Identidad
- She is my friend Relación
Describir
- It is cold Clima/Condición
- They are happy Sentimiento/Estado
- He is tall Característica
Ubicar
- We are at home Lugar
- The book is on the table Posición
Edad/Hora
- I am 20 years old Edad
- It is 5 PM Hora
Formas del 'To Be': ¿Quién usa qué?
Eligiendo 'Am', 'Is' o 'Are'
¿El sujeto es 'I'?
¿El sujeto es singular (he, she, it, o una persona/cosa)?
¿El sujeto es 'you', 'we', 'they', o plural (más de una persona/cosa)?
Usos Comunes del 'To Be'
Identidad
- • I am a student.
- • She is my boss.
Descripción
- • He is tall.
- • The car is red.
Ubicación
- • We are at home.
- • The keys are on the table.
Sentimientos/Estados
- • They are happy.
- • I am tired.
Edad
- • He is 30 years old.
- • How old are you?
Hora/Fecha
- • It is Monday.
- • It is 7 PM.
Ejemplos por nivel
I am happy.
I am happy.
She is a doctor.
She is a doctor.
They are at school.
They are at school.
Are you cold?
Are you cold?
It is a big dog.
It is a big dog.
We are not hungry.
We are not hungry.
He's not from Italy.
He's not from Italy.
The keys aren't in my bag.
The keys aren't in my bag.
Is your mother a teacher?
Is your mother a teacher?
We're very tired after the trip.
We're very tired after the trip.
The weather is usually quite mild here.
The weather is usually quite mild here.
You are being very helpful today.
You are being very helpful today.
Is it true that she is moving?
Is it true that she is moving?
They are both interested in art.
They are both interested in art.
The results are to be announced tomorrow.
The results are to be announced tomorrow.
It is essential that he be informed.
It is essential that he be informed.
The building is currently being renovated.
The building is currently being renovated.
Whether that is the case remains to be seen.
Whether that is the case remains to be seen.
It was her who was responsible for the error.
It was her who was responsible for the error.
The truth is, I am quite exhausted.
The truth is, I am quite exhausted.
Were it not for your help, I would fail.
Were it not for your help, I would fail.
Such is the nature of the business.
Such is the nature of the business.
To be, or not to be, that is the question.
To be, or not to be, that is the question.
The problem is not so much that he is poor, but that he is lazy.
The problem is not so much that he is poor, but that he is lazy.
There is no denying the impact of his work.
There is no denying the impact of his work.
The city is but a shadow of its former self.
The city is but a shadow of its former self.
Fácil de confundir
Many languages use 'have' for age, hunger, and thirst.
Learners use 'It is' to mean 'exists'.
Learners try to contract 'Yes, I am' to 'Yes, I'm'.
Errores comunes
I is happy.
I am happy.
She teacher.
She is a teacher.
I have 20 years old.
I am 20 years old.
They no are here.
They are not here.
Do you be tired?
Are you tired?
Yes, I'm.
Yes, I am.
Is the cats hungry?
Are the cats hungry?
I am being a student.
I am a student.
It's mean that...
It means that...
If I was you...
If I were you...
Patrones de oraciones
I am ___.
She is not ___.
Are they ___?
It is ___ today.
Real World Usage
I'm a photographer based in NYC.
Are you here yet?
I am very interested in this role.
Where is gate 5?
I am sick.
Is this dish spicy?
Practica con los pronombres
I am happy.¡No te saltes el 'To Be'!
She is tired!Las contracciones son tus amigas
Preguntando 'How are you?'
o I'm good, how are you?"Escucha cómo suena
They are here.Smart Tips
Always use 'I'm' followed by your name. It sounds much more natural than 'My name is...'.
Use the full form in positive short answers to avoid sounding unfinished.
Always start with 'It's'. English always needs a subject, even for weather.
Always use 'are', even if you are talking to just one person.
Pronunciación
Contraction Reduction
In fast speech, 'I am' becomes 'I'm' /aɪm/. 'You are' becomes 'You're' /jʊər/.
The 's' sound in 'is'
The 's' in 'is' and 'He's' sounds like a /z/.
Linking 'are'
When 'are' is followed by a vowel, the 'r' is often pronounced clearly (e.g., 'They are at...').
Yes/No Question Rising
Are you happy? ↗
Asking for confirmation.
Statement Falling
I am happy. ↘
Giving information.
Memorízalo
Mnemotecnia
Remember 'A-I-R': Am for I, Is for Singular, Are for Rest.
Asociación visual
Imagine a bridge with three lanes. The first lane is only for a single person named 'I' (Am). The second lane is for single cars (Is). The third lane is for buses with many people (Are).
Rhyme
I am, you are, he is too. We are, they are, how are you?
Story
Once there was a king named 'I' who only liked the word 'Am'. His three children, He, She, and It, shared a small toy called 'Is'. All the other people in the kingdom (You, We, They) had to share a big boat called 'Are'.
Word Web
Desafío
Look around the room and say 5 sentences using 'is' or 'are' to describe what you see (e.g., 'The lamp is on').
Notas culturales
Americans use 'I'm good' to mean 'I am fine' or 'No thank you'.
In some dialects, 'I'm' is used even in places where Americans might use the full 'I am'.
The 'invariant be' is used for habitual actions, while the copula is sometimes omitted for present states.
The English verb 'to be' is a 'suppletive' verb, meaning it comes from three different Proto-Indo-European roots.
Inicios de conversación
Where are you from?
What is your job?
How are you feeling today?
Who is your favorite celebrity?
Temas para diario
Errores comunes
Test Yourself
My sister ___ a doctor.
Find and fix the mistake:
You is very kind.
Arrange the words in the correct order:
All words placed
Click words above to build the sentence
Score: /3
Ejercicios de practica
8 exercisesShe ___ a very kind person.
Which one is correct?
Find and fix the mistake:
I'm not have hungry.
you / from / Are / London / ?
I -> ?, He -> ?, We -> ?
___ (It is) very hot today.
We ___ ready.
Are you a student? Yes, I ___.
Score: /8
Practice Bank
12 exercisesThe weather today ___ sunny.
I ___ from Canada.
Choose the correct sentence:
She not is ready.
Translate into English: 'El libro está en la mesa.'
Arrange these words into a question:
Match the subjects with the correct form:
My friends is very busy this week.
Translate into English: 'Ella no está aquí ahora.'
How old ___ your brother?
Choose the correct sentence:
Arrange these words into a sentence:
Score: /12
Preguntas frecuentes (8)
English is an old language, and the verb 'to be' comes from different roots. It's irregular, so you just have to memorize these specific pairs.
No, in formal writing, you should use the full forms like `I am` or `It is`. Contractions are for speaking and casual writing.
There is no difference in meaning. `Isn't` is just the shorter, more common way to say it in conversation.
In English, age is considered a state of being (who you are), not a possession (something you have).
Both! In English, `you` is used for one person and for a group of people. The verb is always `are` for both.
Only with the subject `I`. It is the most exclusive form of the verb.
Yes, but that's for more advanced tenses like the Present Continuous (e.g., 'I am running'). For now, focus on using it with nouns and adjectives.
Usually, yes. But it can also mean 'It has' in the present perfect (e.g., 'It's been a long day'). Context will tell you which one it is!
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
Ser / Estar
English doesn't distinguish between permanent and temporary 'being'.
Être
French uses 'to have' for physical states like hunger.
Sein
German word order changes more than English in questions.
Desu / Arimasu / Imasu
Japanese verbs don't change based on 'I', 'You', or 'They'.
Zero Copula
Arabic omits the verb entirely in the present affirmative.
Shì (是)
Chinese doesn't use 'to be' with adjectives.
Learning Path
Prerequisites
Continue With
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