1 My neighbour has won a lot of money on the
lottery. He might / must be really happy!
2 Deniz and Kadir may / must play tennis with
us later, but they haven't phoned yet.
3 The postman always comes at exactly this
time. It might / must be him at the door.
4 Your answer to the maths question is 28. That
must / can't be right. It needs to be over 30.
5 'Is that Gemma at the bus stop?' 'Yes, it can't/
might be her.'
6 Justin Bieber is doing a concert in town. There's
a chance that I could / can't see him.