Modals of speculation

'I haven't seen Jeff today. Is he off sick?' 'He __________ be - I saw his car in the car park.'

Look at that guy over there. He's only got a T-shirt on and it's 5 degrees. He _________ be freezing!

What kind of bird is that?' 'I'm not sure. It __________ be an eagle but I can't see it very well.'

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