1‘Look, Rose left her bag here.’
‘It __must__ be Rose’s– her bag is black.’
2‘I passed my driving test!’
‘Congratulations! You _must__ be very happy.’
3‘Where’s Richard?’
‘I don’t know. He __must_ be in a meeting. Shall I look in his diary?’
4‘I’ve just run 20km. I’m training for a marathon.’ ‘Really? You _must__ feel exhausted.’
5‘I thought you _might__ like to borrow this book.’ ‘Oh great, thanks. I was thinking about buying it.’
6‘You’re getting married? You _can’t__ be serious!’ ‘You’re right. I’m just joking.’
7‘Daisy and Martin are on holiday in Sicily this week.’ ‘They _can’t__ be. I’ve just seen Daisy in town.