They _______ (remember) it's my birthday today. Nobody came to my party!
can't have remembered
That floor _______ have a wet spot or something. That customer fell pretty hard.
must
She ______ be disappointed with the airline. I heard her flight had to be cancelled at the last minute.
must
Susan can't dance to save her life! She _________ (be) born with two left feet.
must have been
He________ (ride) a horse many times before. Look how comfortable he is on his horse!
must have ridden
David looks awful this morning. He ______ (have) a good night's sleep.
can't have had
They _______ (got) lucky this time. See how they jump up and down!
must have gotten
Lisa is afraid of swimming. She _______ ( learn) how to swim properly.
can't have learned
The kitchen still smells like Thai curry. I ________ (forgot) to turn on the extractor.
must have forgotten
Monica _________ (fail) to impress the judges. She looks over the moon with joy!
can't have failed
Look at this guy trying to wash his car. It ______ be his first time at it.
must
They _____ be looking forward to their camping trip now. The weather forecast has warned of likely storms this weekend.
can't
It's amazing you could win the karaoke competition! You _______ (practice) a lot for it.
must have practiced
I can see by the look in your eyes, the interview ________ (go) badly.
can't have gone
This guy _____ be sober. He is practically legless.
can't
He hasn't replied to my message yet. That's not like him - he ________ (lost) his phone or something.
must have lost
This chef's talents are off the charts. He ______ be anything but a world-class chef.
can't
For March, the weather is unusually warm. Spring _____ (come) early this year.
must have come