1) He is playing football. a) yes b) no 2) Is he reading? a) Yes, he is. b) No, he isn't. 3) Are they baking a cake? a) Yes, they are. b) No, they aren't. 4) Are they riding a horse? a) Yes, they are. b) No, they aren't. 5) Is he playing tennis? a) Yes, he is.  b) No, he isn't.

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