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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
There's no evidence or research confirming the age of the artifact yet. It MUST HAVE/MIGHT HAVE been from the medieval era.
might have
Scientists are still debating about how the stones were moved to build the pyramids in Egypt. Some believe that the pyramid workers MUST HAVE/MAY HAVE pushed and rolled the stones
may have
Some people believe that aliens MAY HAVE/MUST HAVE helped the Egyptians build the pyramids thousands years ago.
may have
There 's a possibility that prehistoric people MIGHT HAVE/MUST HAVE built the pyramid structure of Gunung Padang 20,000 years ago.
might have
A ghost COULDN'T HAVE/MAY HAVE stolen your watch. You MUST HAVE/COULDN'T HAVE forgotten where you had put it.
couldn't have / must have
I MAY HAVE/MUST HAVE gone completely white because my friends knew something was wrong with me right away.
must have
People saw the river turn red yesterday. Wastes from a nearby factory MAY HAVE/MUST HAVE caused it. The police are still investigating the phenomenon.
may have
