2. выберите правильную форму глагола.1.you must be / can't bevery proud of your son winning so many prizes.2. we thought our cousins would visit us when they were in town last week, but they didn't even phone. i suppose they must be / must have been too busy.3. the film has been such a big success i guess it must be / can't be easy to get tickets to see it.4. i'm sure you could mend this if you really tried. you must be / can't be using the right tools.5. i've just rung the garage to check whether they've fixed my car, but i can't get an answer. i suppose they may have / may be having a tea-break out in the yard.6. i don't know why you wanted to stay at that party. you might have enjoyed / can't have enjoyed talking to all those boring people.7. i can't go out this morning. we're getting a new sofa and the store may be delivering / must be deliveringit today.8. you'll have to check these figures again. they're not accurate. you might have been concentrating / can't have been concentrating when you added them up.9..you must be / must have been thirsty after carrying those heavy boxes. shall i make some tea?