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I'm certain that I left my phone at home.
I must have left my phone at home.
She's crying -- maybe she had an argument with her boyfriend.
She might/may/could have had an argument with her boyfriend.
I'm sure he's read my message -- I sent it hours ago.
He must have read my message.
I'm sure he hasn't gotten lost - he's very good with directions.
He can't have gotten lost.
You saw her yesterday? That's not possible. She's sick at home.
You can't have seen her yesterday.
Maybe he didn't see you. That's probably why he didn't say hi.
He might/may not have seen you.
I'm sure she's bought a new car - I saw her driving a blue Tesla.
She must have bought a new car.
I'm sure he wasn't very sick. He only missed one day of work.
He can't have have been very sick.
They didn't go to the wedding. Maybe they weren't invited.
They may/might not have been invited.
This coffee is too sweet. I'm sure you used too much sugar.
You must have used too much sugar.
You definitely didn't hear my phone in class. It was on silent.
You can't have heard my phone in class.
