Is Mark eating?, Yes, he is., No, he isn't., Yes, he isn't., Is Helen taking a photo?, Yes, she isn't., No, she isn't., Yes, she is., Is John playing the piano?, Yes, he is., No, he isn't., Yes, he isn't., Are they cooking?, Yes, they are., No, they aren't., Yes, they aren't., Is it playing?, Yes, it is., No, it isn't., Yes, it isn't., Are the kids playing a computer game?, No, they are, Yes, they are., No, they aren't., Is he playing chess?, No, he is., Yes, he is., No, he isn't..

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