Ser y estar

Form

ser estar
yo soy estoy
eres estás
él/ella/Ud. es está
nosotros/as somos estamos
vosotros/as sois estáis
ellos/ellas/Uds. son están

Uses of ser

To indicate nationality or origin:

David es de Tejas.
David is from Texas.

To describe intrinsic characteristics:

Los árboles son altos.
The trees are tall.

To indicate dates and time:

Hoy es lunes, 16 de septiembre y son las 11:30 de la mañana.
Today is Monday, the 16th of September, and it is 11:30 in the morning.

To form the passive voice with the past participle:

El premio fue otorgado por el comité.
The prize was awarded by the committee.

Uses of estar

To indicate where people, objects and places are located*:

El coche está en el parking.
The car is in the parking lot.
* Use ser to describe where an event takes place.
La clase de español es en Wescoe.
The Spanish class is in Wescoe.

To express mental states that result from an action or event:

Estoy deprimida porque saqué una “F” en el examen.
I’m depressed because I got an “F” on the exam.

To express physical states that result from an action or event:

El chico está cansado después de correr 5 millas.
The boy is tired after running 5 miles.

To express something unexpected:

¿No está muy delgada Carolina?
Doesn’t Carolina look really thin?

In general, the verb ser is used to express characteristics or inherent circumstances, while the verb estar is used to describe a resulting state. Equating ser with permanent states and estar with non-permanent states, can lead to erroneous verb use. Take a look at the following example:

Mi abuela se murió el año pasado.
My grandmother died last year.
Mi abuela está muerta.
My grandmother is dead.

Death is a permanent state but estar is used because death is the state or condition resulting from dying.