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It was unnecessary for you to clean the floor. You ..
shouldn't have cleaned the floor.
It was a mistake to park outside the police station. You ...
shouldn't have parked outside the police station
I'm sure David took your book by mistake. David ...
must have taken your book by mistake.
I'm sure that Liz hasn't met Harry before. Liz ..
can't/couldn't have met Harry before.
Heather possibly hasn't left yet. Heather ..
may/might not have left yet.
I'm sure they haven't eaten all the food. It's not possible! They ...
can't have eaten all the food.
Perhaps Pam and Tim decided not to come. Pam and Tim ...
might have decided not to come.
I'm sure it was the cat that took the fish from the table. The cat ...
must have taken the fish from the table.
It was wrong of you to shout tothat homeless. You ...
shouldn't have shouted tothat homeless.
I'm certain that the man committed suicise. The man ...
must have committed suicide.
It's possible that Winston volunteered in the animal shelter, but I'm not sure. Winston
may/might have volunteered in the animal shelter.
I'm sure she didn't feel any sympathy for him. She ...
can't have felt any sympathy for him.
I'm sure that the government took steps to end the poverty problem in the city. The government ...
The government must have taken steps to end the poverty problem in the city.
I'm sure the citizens were really disappointed with the measure. The citizens ...
must have been really disappointed with the measure.
I'm certain Jennifer didn't know about the living conditions of her daughter. Jennifer ...
can't have known about the living conditions of her daughter.
Maybe she was ill on Saturday. She ..
might/may have been ill on Saturday.
