Following are some of the most common ways that estar is used as other than as the equivalent of the English "to be." The form of estar used is followed by possible definitions and some brief sample sentences:
estar to stay, to remain Estaré dos días. I'll stay two days.
estar to be ready Aún no está la cena. The dinner still isn't ready. Estará a las dos. It will be ready at 2.
estar to be here, to be available, to be in Susana no está. Susana isn't in.
¿Estamos? Right? You understand? Do we agree? Salimos a las tres ¿estamos? We're leaving at 3, right?
estarse to stay, to remain Puedes estarte aquí. You can stay here.
estar a (especially when used in the first-person plural) to be (a certain date or temperature) Hoy estamos a 25 de diciembre. Today is December 25. Estábamos al lunes. It was Monday. Estamos a treinta grados. It's 30 degrees.
estar con various translations, depending on the phrase used La niña está con sarampión. The girl has measles. Yo estaba con depresión. I was depressed. Flora estaba con una bata blanca. Flora was wearing a white housecoat.
estar de, estar como to work as or to act as (especially when on a temporary basis) Pedro está de pintor. Pedro está como pintor. Pedro is working as a painter.
estar de various translations, depending on the phrase used No estoy de acuerdo. I don't agree. Ana está de vuelta. Ana is back home. Están de charla. They're chatting. Estamos de vacaciones. We're on vacation.
estar en que to be based on, to lie in, to be with (when used as in the example given) El problema está en que el color. The problem is with (or is based on, or lies in) the color.
estar en que to be of the opinion of, to believe Estoy en que hay perros que no pueden ser entranados. I believe there are some dogs that can't be trained.
estar para to be about to, to be ready for, to be in the mood for Estamos para salir. We're about to leave. No estoy para amor. I'm not in the mood for love.
estar por to be in favor of Estaba por la liberación de los esclavos. He was in favor of freedom for the slaves.
estar por to be about to, to be on the verge of (This usage is more common in Latin America.) Estamos por ganar. We're about to win.

