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Title: To be (ser o estar) 

Present 

I am (yo soy o estoy)

She is (Ella es o esta) He is (El es o esta) It is (esto es o esta) 

We are (Nosotros somos o estamos) They are (Ellos son o estan) You are (tu eres o estas) 

Past (Afirmativo) +

I was (yo era o estaba) 

She was (Ella era o estaba) He was (El era o estaba) It was (Esto era o estaba) 

We were (Nosotros eramos o estabamos) They were (Ellos eran o estaban) You were (Tu eras o estabas)

Past (Negativo) -

I/She/He/It  was not 

We/ They/You were not 

Past (pregunta y respuesta corta) ?

Was I in the school ? Yes, I was / No, I wasn´t 

Were they couple two years ago? Yes, they were/ No, they weren´t