1) Is Mark eating? a) Yes, he is. b) No, he isn't. c) Yes, he isn't. d) No, he is. 2) Is Helen taking a photo? a) Yes, she is. b) No, she isn't. c) Yes, she isn't. d) No, she is. 3) Is John play the piano? a) Yes, he is. b) No, he isn't. c) Yes, he isn't. d) No, he is. 4) Are they cooking? a) Yes, they are. b) No, they aren't. c) Yes, they aren't. d) No, they are. 5) Is it playing? a) Yes, it is. b) No, it isn't. c) Yes, it isn't. d) No, it is.

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