Reglas del Verbo "To Be"

Forma Afirmativa (+)

Forma completa	Forma contraída
I am	I'm
You are	You're
He/She/It is	He's/She's/It's
We/They are	We're/They're

Ejemplos: I am Jack. You're so beautiful. He's a singer. They're at school.

Forma Negativa (-)

Forma completa	Forma contraída
I am not	I'm not
You are not	You aren't
He/She/It is not	He/She/It isn't
We/They are not	We/They aren't

Ejemplos: I'm not from Spain. You aren't late. She isn't tired. They aren't at home.

Preguntas (?)

Pregunta	Ejemplo
Am I...?	Am I in class?
Are you...?	Are you at home?
Is he/she/it...?	Is he tired?
Are we/you/they...?	Are they busy?

Respuestas Cortas

Afirmativas	Negativas
Yes, I am.	No, I am not.
Yes, you are.	No, you aren't.
Yes, he/she/it is.	No, he/she/it isn't.
Yes, we/you/they are.	No, we/you/they aren't.

Usos del Verbo "To Be"

Identidad: I am a student.
Edad: She is 25 years old.
Nacionalidad: We are Mexican.
Estado/condición: You are tired.
Ubicación: The book is on the desk.
Hora/fecha: It is 3 o'clock.
Profesión: He is a doctor.
Características: They are very tall.