1) She must have been very talented since the jury awarded her the first prize.

2) The river must have been way far from what we expected it to be. We’ve covered around 15 extra miles and still haven’t gotten on the river bank.

3) It might have been a good outcome for you to make up with them. Better late than never, as they say, but you didn’t do it.

4) You may have seen them there if you really attended the class. The twins were considered the most diligent students, especially Joe.

5) My parents could have lived together, but they preferred to get divorced.

6) It can’t have been her, insofar as she went out of town on Saturday.

7) They couldn’t have been that cruel, I’m sure. They might be a bit rude, but such extreme cruelty isn’t their demeanor.