It is possible that you forgot your wallet at home.
You MIGHT/COULD/MAY HAVE FORGOTTEN your wallet at home.
Kate is shivering. She ____________ be cold.
must
Rephrase "It's late. I'm certain that you are tired"
It's late. You MUST be tired.
The burglars _____________ been looking for jewellery - nobody really knows.
might have
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
They _____________ this room yesterday - look, it's filthy!
can't have cleaned
I'm sure Jane is sleeping now.
Jane MUST BE SLEEPING now.
Rephrase "I'm certain that Jack isn't married - he's only 17"
Jack CAN'T BE MARRIED - he's only 17.
Rephrase "I'm certain that she cheated in the exam".
She MUST HAVE CHEATED in the exam.
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'm sure you didn't forget to do your homework.
You CAN'T HAVE FORGOTTEN to do your homework.
Jacqui ______________ be at the sports centre. It's closed.
can't
The chair broke as soon as he sat on it. It ______________ been very well made.
can't have
Rephrase "Take your umbrella. It's possible that it will rain"
Take your umbrella. It MIGHT rain
I can see people opening their umbrellas. It ______________ be starting to rain.
must
Perhaps he left the car unlocked.
He MIGHT/MAY/COULD HAVE LEFT the car unlocked.
Emily is crying. She ___________ be sad.
must
I didn't hear you come in last night. I ___________ (be) asleep.
must have been
It is impossible that he is Spanish.
He CAN'T BE Spanish.
I'm not sure where John is. He _____________ still be at work.
might
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