Where is David? He..._ be at school. Classes begin at 8., may, must, can, Derek...be at work, or perhaps he's in the gym - or at his friend's., can, must, might, Who's that at the door? It ...be Susie — she's still at work now., can't, mustn't, may not, I haven't got my keys!I ...have left them in the taxi., can, may, must, She looks too young. She...be a doctor., mustn't, can't, may not, Your mum looks tired. She ...have been working all day., must, can, may, Emma has a huge library in her house. She.... love books., can, must, might, They ...be living in London at the moment, but I'm not sure., must, can, may, Jane ....have left the party with John last night, but I didn't see it., might, must, could

Modals +infinitive form 9

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