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conjugating as am, is, are (present) or was, were (past) to describe the condition or identity of a subject, either in affirmative, negative, or interrogative form.

It is used to talk about characteristics, professions, nationalities, locations, or as an auxiliary verb to form continuous tenses, such as in 'I am studying'.

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Affirmative:

I am happy. (Yo estoy feliz.) She is a doctor. (Ella es médica.) We are in the car. (Nosotros estamos en el coche.) They are waiting. (Ellos están esperando.)

Negative: We are not on the same level. (No estamos en el mismo nivel.) She is not afraid. (Ella no está asustada.)

Interrogative: Is: it the right place? (¿Es el lugar correcto?) Am: I ready? (¿Estoy listo?) Past (to be): I was a doctor. (Yo era doctor.) They were not at the party. (No estaban en la fiesta.) Was: she an accountant? (¿Ella era contadora?)

Future (to be): She will be at work tomorrow. (Ella estará en el trabajo mañana.)

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Keep in mind that the verb 'to be' is also used as an auxiliary verb in the continuous tense group. In this case, it is used even if there is a main verb in the sentence that indicates the action. This is the formula for forming the continuous tenses, which must be memorized: to be + verb + -ing ending. The combination of to be + verb does not occur: I am do, he is read, they are work.

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importance of the verb to be