The house is huge, so it _____ have belonged to the royal family. (must, could)
must
There are bedrooms in the building, so it ____ have been a temple. (might not, couldn't)
couldn't
No one's ever found it. It _____ exist. (must not, might not)
must not
There are many jewels on this necklace. It ____ be very valuable. (might, must)
must
This house _______ have belonged to the royal family. (could/might, must)
could/might
However, it _____ have belonged to an important person at all. (might not, must)
might not
But the treasure _____ even exist. (couldn't, might not)
might not
We use the modal verbs can't/couldn't, must and must not if we are MORE SURE about the fact or the speaker has much more confidence in what is being said. (True, False)
True
We use the modal verbs could/might and might not if we are LESS SURE about the fact or the speaker is just guessing. (True, False)
True
It ______ be in that cave. It's too high. (could/might, can't/couldn't)
can't/couldn't
The lost treasure ______ be in a cave. (could/might, must)
could/might
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