Sentence examples similar to have guessing from inspiring English sources

Who would have guessed?

(I wouldn't have guessed).

Who'd have guessed this?

Who would have guessed that?

I probably should have guessed.

We might have guessed.

Who could have guessed?

I should have guessed.

Whoever could have guessed?

(Actually, maybe I could have guessed).

I would have guessed all the vertebrates.