This document provides examples of regular and irregular verbs in English (to be and to study) and their conjugations in the simple, perfect, and continuous tenses. It shows the affirmative, negative, and interrogative forms of the verbs in the present, past, and various compound tenses. The tenses described include the simple present and past, present and past perfect, and present and past continuous. Examples are provided for the first, second, and third person singular conjugations.

1. TO BE (como ejemplo de verbo irregular)/ TO STUDY (como ejemplo de verbo regular)
TIEMPOS SIMPLES/ SIMPLE TENSES
AFFIRMATIVE NEGATIVE QUESTION
TO BE TO STUDY TO BE TO STUDY TO BE TO STUDY
S+don't+ v v+s do/does+s´v?
I am I was I study I studied I am not I wasn't I don't study I didn't study Am I? Was I ? Do I study? Did I study?
soy fui/ estudio estudié/ no soy/estoy no fui/ no estudio no estudié/ Soy? fuí? Estudio? estudié?
estuve/ estudiaba estuve/ estudiaba Estoy? Estuve?
estaba estaba
You are you were You study you studied you aren't You weren't You don't study you didn't study Are you? Were you? Do you study? Did you study?
eres fuiste/ estudias estudiaste/ no eres/estás no fuiste/ no estudias no estudiaste/ Eres? Eras? Estudias? Estudiaste?
estuviste/ estudiabas estuviste/ estudiabas Estás? Estabas?
estabas estabas
he wasn't
He is he was He/she/it study he studied he/she/ isn't no fué/ estuvo/ She doesn't study he didn't study Is he/it? Was he? Does she/ study? Did he study?
es fue/ estudia estudia/ no es/está estaba no estudia no estudió/ Es? Era? Estudia? Estudió?
estuvo/ estudiaba estudiaba está? Estaba?
estaba
PRESE PASADO PRESENTE PASADO PRESENTE PASADO PRESENTE PASADO PRESEN PASADO PRESENTE PASADO
NTE TE

2. TIEMPOS PERFECTOS/ PERFECT TIMES
(NORMALMENTE USADOS CON: FOR, SINCE, YET, ALREADY, JUST, EVER, NEVER)
TO HAVE + V-PARTICIPLE
AFFIRMATIVE NEGATIVE QUESTION
TO BE TO STUDY TO BE TO STUDY TO BE TO STUDY
I have been I have studied I haven't been I haven't studied Have I been? Have I studied?
he sido/ he estudiado no he sido/ no he estudiado ¿He sido yo? ¿he estudiado?
he estado I have never been Have I ever
nunca/no he estado been?
¿He estado yo?
You have been You have studied you haven't been You haven't Have you studied?
has sido/ has estudiado no has sido studied Have you been? ¿has estudiado?
has estado you have never no has estudiado ¿Has sido tú?
been Have you ever
nunca/no has been
estado ¿has estado?
He has been He/she/ has studied
ha sido/ ha estudiado She/ hasn't Has he/ she
ha estado he/she hasn't been studied Has he/she been? studied?
no ha sido no ha estudiado Ha sido él/ella? ¿Ha estudiado?
he has never been Has he ever
nunca/no ha been?
estado ¿Ha estado?
PRESENTE PAS PRESENTE PASA PRESENTE PASA PRESENTE PASA PRESENTE PASA PRESENTE PASA
ADO DO DO DO DO DO

3. TIEMPOS CONTÍNUOS/ CONTINUOUS TIMES
(EN PASADO SUELE USARSE CON WHEN, WHILE)
TO BE + V-ING
AFFIRMATIVE NEGATIVE QUESTION
TO STUDY TO STUDY TO STUDY
I am studying I was studying I am not studying I wasn't studying Am I studying? Was I studying?
estoy estudiando estaba estudiando no estoy estudiando no estaba estudiando ¿Estoy estudiando? ¿Estaba estudiando?
You are studying you were studying You aren't studying You weren't studying Are you studying? Were you studying?
estás estudiando estabas estudiando No estás estudiando no estabas estudiando ¿estás estudiando? ¿Estabas estudiando?
He/she/it is studying he was studying He/ she isn't studying She/he wasn't studying Is he/she studying? Was he/she studying?
está estudiando estaba estudiando No está estudiando no estaba estudiando ¿Está estudiando? ¿Estaba estudiando?
PRESENTE PASADO PRESENTE PASADO PRESENTE PASADO