Verb To be in past

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VERB TO BE IN PAST

This is an auxiliar verb that it´s used to express the personal information but in past, it refers about origins, physical description and location.
Ex:

I was a student 5 years ago.
My grandmother was  Canadian.
They were in the school yesterday.

NOTE: When we talk about objects, if they are singular we use was and for plural were.
Example: My favorite book was The Nutcracker
                 My favorite animals were lions.

STRUCTURES

Was/Were Born

It refers in specific about the  birthday and the birthplace.
we use the wh-questions WHEN (¿cuándo?), WHERE (¿dónde?)

BIRTHDAY (FECHA DE NACIMIENTO)
When were you born?(Fecha) ¿Cuándo naciste?
I was born on January 2nd 1980  Yo nací el 2 de enero del 1980
When was he/she born?(Mes) ¿Cuando nació el o ella?
He was born in September        El nació en septiembre
When were they born?(Año) ¿Cuándo nacieron?
They were born in 2002         Ellos nacieron en el 2002

BIRTHPLACE (LUGAR DE NACIMIENTO)
Where were you born?(País)        ¿Dónde naciste?
I was born in USA                         Yo nací en EU
Where was he/she born? (Ciudad)  ¿Dónde nació?
She was born in New York             Ella nació en Nueva York
Where were they born?(Lugar)       ¿Dónde nacieron?
They were born in the hospital        Ellos nacieron en el hospital