speculations

et's look at some other examples:

'Paul looks tired, he must have been out late last night.'
'I could have won the race if I had trained harder.'
'He might have gotten really sick if he hadn't started taking care of his health.'
'She may have taken the day off, because I haven't seen her today.
'I saw a strange light in the sky last night. It could have been a UFO!'

• She looks sad. She must have ___ some bad news.
  
  has
  having
  had
  have
  
• It might have ___ raining.
  
  stop
  stops
  stopping
  stopped
  
• She must have already ___ my name.
  
  know
  knew
  knows
  known
  
• He may have ___ them in his car.
  
  takes
  taken
  taked
  took
  
• The bird is gone, it must have ___ away.
  
  fly
  flown
  flow
  few
  
• He must have ___ himself after falling off his bike.
  
  hurting
  hurted
  hurts
  hurt
  
• The sign is missing, they must have ___ it.
  
  removes
  remove
  removing
  removed

For each sentence, choose between can't, might or must to fill each space.

1. Your mother  be a great cook. You are always so keen to get back home to eat!

2. I don't know why I am so tired these days. I  be working too hard. Or maybe I am not sleeping too well.

3. Do you know where Carl is? He  be out - his car keys are on the table.

4. You seem to know everything about the theatre. You  go every week.

5. To give the promotion to Harold was silly. He  know much about this company after only a year working here.

6. Go and look in the kitchen for your gloves. They  be in there.

7. Oh, the phone is ringing. Answer it. It  be Kate. She always rings at this time.

8. Dan has been drinking that whiskey since early this afternoon. He be totally drunk by now.

9. That couple  think much of this film. They're leaving already - after only 20 minutes!

10. That's the second new car they have bought this year. They be very rich!