yo
soy
Spanish 101 · Grammar
Ser conjugation
Ser is irregular in every tense — start by locking down the present forms you will use in every class.
The rule
Present indicative: soy, eres, es, somos, sois, son. There is no pattern to guess — memorize and drill.
Ser introduces predicate nouns and adjectives of identity or classification: Es médico, Somos amigos.
Because subject pronouns are often dropped, the ending carries the person: Es estudiante could be he, she, or you (usted) — context decides.
Never *soy es* or *somos son* — one finite verb per clause unless you use a conjunction.
Ustedes son muy amables.You all are very kind.
Es la una y cuarto.It is one fifteen. (clock)
Examples in context
Ella es médica.She is a doctor (profession).ser — profession
Madrid es la capital de España.Madrid is the capital of Spain.ser — classification
Son las cuatro y cuarto.It is four fifteen.ser — clock time
Estoy cansado hoy.I am tired today (temporary state).estar — condition
El libro está en la mesa.The book is on the table.estar — location
La tienda está cerrada.The shop is closed (resultant state).estar — resultant state
Mi hermano es alto.My brother is tall (inherent trait).ser — trait
Estamos en clase.We are in class.estar — location
Quick reference
tú
eres
él/ella/usted
es · ellos/ellas/ustedes: son
Common mistakes
Using ser for location
❌ Wrong: ¿Dónde es el baño?
✅ Correct: ¿Dónde está el baño?
Location of things and people uses estar, not ser.
Using estar for profession
❌ Wrong: Estoy profesor.
✅ Correct: Soy profesor.
Profession and identity use ser.
Using estar for clock time
❌ Wrong: Están las tres.
✅ Correct: Son las tres.
Clock time uses ser: son las…
Mixing up bored meanings
❌ Wrong: Ella es aburrida. (when you mean bored)
✅ Correct: Ella está aburrida.
Aburrido with estar often means bored; with ser it means boring.
Practice questions
Test what you just learned. Select an answer to see instant feedback.
Nosotros _____ estudiantes.
¿De dónde _____ usted?
Ellos _____ de México.
La fiesta _____ el sábado.
Tú _____ muy simpático.
You got 0/5 correct.
Want more practice on Ser conjugation?
Chapurra has 50 questions like these, organized by chapter. Capítulo Preliminar is free.
Start practicing free →FAQ
Is estar always for “temporary” and ser for “permanent”?
That shortcut breaks quickly. Location uses estar even when it lasts years (México está en América). Events and clock time often use ser (La clase es a las diez; Son las tres). Think “definition or classification” versus “where something is or how it is right now,” not a timer.
Why does the same adjective with ser vs. estar change the English meaning?
Spanish often uses ser + adjective for a stable trait or category and estar + the same adjective for a passing state or impression. Classic pairs include aburrido (boring vs. bored), listo (clever vs. ready), and bueno (good vs. tasty or “well behaved” in context). Your textbook will list the most common shifts.
Do I use ser or estar with past participles like cerrado?
For resultant states (“closed,” “broken,” “written”), Spanish usually uses estar: La tienda está cerrada. Passive sentences with an agent (fue escrita por…) are a separate, more advanced pattern. In first-year courses, estar + participle for state is the pattern you drill most.
Which verb do I use for profession or major?
Identity and category take ser: Soy estudiante, Ella es ingeniera. Estar would signal a staged or unusual reading, not a neutral job title. If you are stating what someone “is” in a definitional way, start with ser.
How do I choose when both ser and estar seem possible?
Ask whether you are locating the subject, describing a current condition or result, or using a progressive (estar + gerund). If instead you are classifying, giving origin, telling time, or framing a scheduled event, ser is more likely. When in doubt, say the sentence aloud with both verbs and pick the one native speakers use in parallel examples from class.