Correct: I am, you are, he is, Mary is, She is, we are, they are, Bob is, it is, Mum and dad are, the cat is, the dog is, Olga is, Mum is, Dad is, the dogs are, the cats are, Incorrect: I is, he are, they is, she are, we is, we am, I are, he am, they am, she am, it are, it am, you am, you is,

to be

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