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There's a chance we'll have a test today. We...
We might have a test today.
Oops!
Okay!
It was possible for you to pick me up from the hospital.
You could have picked me up from the hospital.
Oops!
Okay!
It is not necessary to go to university to get a good job nowadays. You...
You don't have to / don't need to / needn't go to university to get a good job nowadays.
Oops!
Okay!
It was compulsory for them to knock at the door before entering. They...
They had to knock at the door before entering.
Oops!
Okay!
I'm sure that he has finished the exercise. He...
He must have finished the exercise.
Oops!
Okay!
Taking my computer without telling me was the wrong thing to do. You...
You shouldn't have taken my computer without telling me.
Oops!
Okay!
Playing loud music after midnight is forbidden. You...
You mustn't play loud music after midnight.
Oops!
Okay!
I'm sure Andrew's boss wasn't happy that he missed the meeting. Andrew's boss...
Andrew's boss can't have been happy that he missed the meeting.
Oops!
Okay!
He is definitely stressed. He...
He must be stressed.
Oops!
Okay!
It wasn't a good idea to leave the mobile on the table while she wasn't looking. She...
SHe shouldn't have left the mobile phone on the table while she wasn't looking.
Oops!
Okay!
It isn't certain that Brad Pitt will accept the role. Brad Pitt...
Brad Pitt might not accept the role.
Oops!
Okay!
I am certain you haven't seen John because he is on holiday. You...
You can't have seen John because he is on holiday.
Oops!
Okay!
I wanted to pay for the meal but I had forgotten my card. I...
I would have paid for the meal (but I had forgotten my card...)
Oops!
Okay!
I'm sure I didn't leave my sunglasses at the café. I...
I can't have left my glasses at the café.
Oops!
Okay!
If you had studied harder, you would have passed. You...
You should have studied harder.
Oops!
Okay!
It is possible that Nick missed the bus. Nick...
Nick might have missed the bus.
Oops!
Okay!
I don't have the ability to remember recent events. I...
I can't remember recent events.
Oops!
Okay!
I didn't know how to cook when I was younger. I...
I couldn't cook when I was younger.
Oops!
Okay!
Perhaps Jane is in the garden now. Jane...
Jane might be in the garden now.
Oops!
Okay!
It isn't compulsory to knock at the door before entering. You...
You don't have to knock at the door before entering.
Oops!
Okay!
I wanted to go to the party but I was too ill. I...
I would have gone to the party.
Oops!
Okay!
It is necessary to wear uniform to work. You...
You have to wear uniform to work.
Oops!
Okay!
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