English as an Additional Language/Copular verb to be: present tense
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'To be' is one of the most important verbs in the English language, known as a 'copular verb'. Sadly it is very irregular, so its pattern in the present tense must be learned by heart.
[edit] The Present Tense
I am.
You are.
He is.
She is.
It is.
We are.
They are.
I am 36 years old.
They are hungry.