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