Rephrase "Take your umbrella. It's possible that it will rain"
Take your umbrella. It MIGHT rain
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
Rephrase "It's late. I'm certain that you are tired"
It's late. You MUST be tired.
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.
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.
The chair broke as soon as he sat on it. It ______________ been very well made.
can't have
I can see people opening their umbrellas. It ______________ be starting to rain.
must
The burglars _____________ been looking for jewellery - nobody really knows.
might have
They _____________ this room yesterday - look, it's filthy!
can't have cleaned
Jacqui ______________ be at the sports centre. It's closed.
can't
There's no juice in the fridge. Somebody ______________ it.
must have drunk
I'm not sure where John is. He _____________ still be at work.
might
