1) Is he reading?  a) Yes, he is. b) No, he isn't. 2) Is she texting a friend?  a) Yes, she is. b) No, she isn't. 3) Are they doing homework?  a) No, they aren't. b) Yes, they are. 4) Is she playing video games? a) No, she isn't. b) Yes, she is. 5) Are they waiting for a bus?  a) Yes, they are.  b) No, they aren't. 6) Is he sleeping?  a) Yes, he is. b) No, he isn't. 

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