Yes, they are - Are David and Helen playing tennis?, No, they aren't. - Are Tom and Bridget eating sandwiches?, Yes, he is. - Is Alan listening to music?, Yes, she is. - Is Mary running?, No, he isn't. - Is Sam singing?, No, she isn't. - Is Bridget running?, Yes, it is. - Is the cat sleeping?, No, it isn't. - Is the dog sleeping?,

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