The burglars _____________ been looking for jewellery - nobody really knows.
might have
They _____________ this room yesterday - look, it's filthy!
can't have cleaned
I'm not sure where John is. He _____________ still be at work.
might
Jacqui ______________ be at the sports centre. It's closed.
can't
It is impossible that he is Spanish.
He CAN'T BE Spanish.
I'm sure you didn't forget to do your homework.
You CAN'T HAVE FORGOTTEN to do your homework.
The chair broke as soon as he sat on it. It ______________ been very well made.
can't have
Rephrase "I'm certain that she cheated in the exam".
She MUST HAVE CHEATED in the exam.
Emily is crying. She ___________ be sad.
must
Rephrase "I'm certain that Jack isn't married - he's only 17"
Jack CAN'T BE MARRIED - he's only 17.
Rephrase "It's late. I'm certain that you are tired"
It's late. You MUST be tired.
I'm sure Jane is sleeping now.
Jane MUST BE SLEEPING now.
Rephrase "It's impossible that you've spent all your money. It's only the second day of your holiday"
You CAN'T HAVE SPENT all your money. It's only the second day of your holiday.
I can see people opening their umbrellas. It ______________ be starting to rain.
must
I had an umbrella when I went out but I haven't got it now. You __________ (leave) it in the park
might / could / may have left
Kate is shivering. She ____________ be cold.
must
There's no juice in the fridge. Somebody ______________ it.
must have drunk
Rephrase "Lucy can't find her laptop. It's possible that she left it on the train"
Lucy can't find her laptop. She MIGHT HAVE LEFT it on the train
I didn't hear you come in last night. I ___________ (be) asleep.
must have been
Rephrase "Take your umbrella. It's possible that it will rain"
Take your umbrella. It MIGHT rain
Perhaps he left the car unlocked.
He MIGHT/MAY/COULD HAVE LEFT the car unlocked.
It is possible that you forgot your wallet at home.
You MIGHT/COULD/MAY HAVE FORGOTTEN your wallet at home.