He says he's studying, but he's watching TV. He _______ (study)!, He can't (couldn't) be studying!, She claims she's on a diet, but she's eating a burger. She _______ (be) on a diet!, She can't (couldn't) be on a diet!, The lights are off. He _______ (be) at home!, He can't (couldn't) be at home!, He's failed the exam. _______ he _______ (smile)?, Can (could) he be smiling?, She's laughing at a sad movie. She _______ (be) sad!, She can't (couldn't) be sad!, They say they're lost, but they have a map. _______ they _______ (be) lost?, Can (could) they be lost?

3.2. Can't be doing

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