How much you learn about the proper use of ser and estar (both meaning "to be") depends on your exposure to how real Spanish is spoken by real people. This lesson focuses on how a person can use estoy (“I'm” —the first-person singular form of estar in the present tense) to talk about himself or herself.
 

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The present tense of the verb estar (to be) is estoy. You can use it combined with an adjective (or a participio—the -ado, -ido, -to, -so, -cho endings and their feminine and plural forms, used as an adjective) to express your current state of mind, body, or soul:

...Yo estoy listo ya... ¿Dónde está el perro?

...I'm ready now... Where's the dog?

Caption 108, 75 minutos - Del campo a la mesa - Part 5

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It's very common, for example, to use estar to talk about emotions, convictions, and beliefs:
 

Bueno, pero estoy muy contenta. Pasa.

Well, but I am very happy. Come in.

Caption 12, 75 minutos - Gangas para ricos - Part 6

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Yo creo que sí. -Estoy convencido que poco a poco vamos a... a buscar alternativas.

I think so. -I am convinced that little by little we are going to... to look for alternatives.

Captions 64-65, 75 minutos - Gangas para ricos - Part 5

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You can use any other regular adjective as well. Some examples are below:
 
Estoy limpio - I'm clean.
Estoy enferma - I'm sick.
Estoy sola - I'm lonely.
 
At this point it's useful to compare the possible meaning of similar phrases using ser instead of estar. Note how, by using ser instead of estar, the adjective becomes an intrinsic characteristic of the subject:
 
Soy limpio - I'm a clean person.
Soy enferma - Incorrect, it’s better to say soy una persona enferma "I'm a sick person," or even just estoy enferma (I’m sick), because this phrase can also mean “I’m a sick person” given the appropriate context.
Soy sola - Incorrect, it’s better to say soy una persona solitaria (I'm a lonely person).
 
You can combine estoy with the gerundio (-ando / -endo / -iendo endings) to talk about your actions, about what you are doing. The combination with haciendo, the gerundio of the verb hacer (to do) is very common:
 

Yo estoy haciendo el control de calidad del producto.

I'm doing the quality control of the product.

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But you can combine estoy with any other gerundio, for example cogiendo, the gerundio of coger (to grab, to pick):
 

Hasta que no palme estoy cogiendo castañas.

As long as I don't croak, I'm picking chestnuts.

Caption 6, 75 minutos - Del campo a la mesa - Part 5

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You can use estoy with a complement that denotes space to specify your location. The combination with an adverb of place is common:
 

Por eso estoy aquí, porque me han dicho...

That's why I am here because they have told me...

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And also with the preposition en (in):
 

Eh... Ahora mismo estoy en Málaga, estoy de vacaciones.

Um... Right now I'm in Malaga, I'm on vacation.

Caption 2, Arume - Málaga, España - Part 1

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The verb estoy can also be combined with certain prepositions to express a wide array of ideas. For example, you can use it with the preposition de to talk about your role or position in a certain context:
 

Eh, y... estoy de acuerdo con, con Denisse ahí,

Uh, and... I agree (literally, "I'm in accord") with, with Denisse there.

Caption 24, Belanova - Entrevista - Part 3

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No, luego, cuando acaba la campaña estoy de camarero.

No, after, once the season ends, I work as a waiter.

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Eh... Ahora mismo estoy en Málaga, estoy de vacaciones.

Um... Right now I'm in Malaga, I'm on vacation.

Caption 2, Arume - Málaga, España - Part 1

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You can combine the verb estoy with the preposition por  and a verb in infinitive (-er, -ar, -irendings) to talk about what you are about to do:
 
Estoy por ganar el juego de scrabble. 
I'm about to win the Scrabble match.
 
Estoy por terminar. Espérenme, por favor.
I'm about to finish. Please, wait for me.
 
You can use estar and the preposition para to talk about purpose, function, etc.
 
Aquí estoy para servir. 
I'm here to serve.
 
Here's an interesting example from our catalog of videos:
 

o estoy para dirigir cine tal vez.

or maybe, I'm suited to direct a movie.

Caption 68, Arturo Vega - Entrevista - Part 1

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BANNER PLACEHOLDER

There are many other ways in which you can use the verb estoy; these are just some of the most common ones. For now, we recommend you practice these expressions, maybe try transforming them into the past or future tenses!  Our next lesson in this series will focus on how soy (the first-person singular form of ser in the present tense) can be used to talk about oneself.