The creature I saw yesterday looked like a dog, but it had spikes on its bag. It COULDN'T HAVE/MUST HAVE been a dog. Dogs don't have spikes on their backs
couldn't have
I heard my grandma's voice in my room last night. I MUST HAVE/MUSTN'T HAVE been dreaming because my grandma passed away years ago.
must have
I think I saw Bigfoot crossing the street in front of me last night, but I'm not sure. I MUST HAVE/MIGHT HAVE seen a big bear.
might have
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