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These are the present and past tense forms of the verb TO BE...in first, second, and third person singular and plural.
What is (presente tense) I AM, WE ARE, YOU ARE, YOU ARE, and HE/SHE/IT IS, THEY ARE ... (past tense) I WAS, WE WERE, YOU WERE, YOU WERE, HE/SHE/IT WAS, THEY WERE