That bird ... be a penguin. It flew onto the roof., can't, could, Our dog hasn't moved. He ... be ill., could, can't, I can hear a mosquito. It ... bite you., must, might., It's big and it's got brown fur. It ... be a bear., might, can't, The cat's asleep. She ... be sleepy today., must, can't, It's got four legs, so it ... be a snake., could, can't, I can hear a voice speaking, but there's nobody here. It ... be that parrot., must, can't.

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