A : Abdullah didn't come to the class yesterday . I wonder why . B : I'm not sure . He could have / should have been busy, I guess .
could have
A : I only used your laptop to send a few pictures . I don't see why you're so upset . B : Well , you couldn't have / shouldn't have been using it without my permission .
shouldn't have
Sara try not to speak in front of her neighbors to prevent problems.
avoid
Ali always makes his problem worse.
aggravate
My sister never does anything about her problems.
Ignore
I needed to / didn't have to call her, but I wanted to make sure she's well.
didn't have
Yoko needed to / wasn't supposed to ignore her parents ' advice , but she did .
wasn't supposed
A : Marnie wasn't at home yesterday . Was she with you ? B : Well , she couldn't have / must have been with me . I can't stand her.
couldn't have
He solved the problem himself , so he didn't need to call / should have called his parent. .
didn't need to
When I got older , I had to / wasn't supposed to learn to solve my own problems .
had to
The phrase "have a hunch" shows....
Uncertainty
A: Have you seen my bag ? It was right here on the bed. B : Oh, yah. Sara couldn't have / must have taken it .
must have
The phrase "know for a fact"shows......
certainty
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