1. Kate must/could /ought be at the tech festiwal - I'm not certain. 2. Steve is very late - where shall/can/my he be? 3. Tim needn't/mustn't/wasn't able to sleep-his phone was ringing all the time. 4. Jane might /can/would like this app, but I'm not sure. 5. Helen can't /should /must be at work - she doesn't work on Saturdays.
