which meaning of the word 'would ' is used here?

Question

In which meaning 'would ' is used here in the following sentences :

1. Who would have thought her capable of murder? (In which meaning 'would ' is used here ?)

2. They were in the same class, so they would have known each other.

3. He grew so angry, it seemed he would explode.

Answer 1

In all of you examples would could be substituted with might, with the definition

"expressing a conjecture, opinion, or hope"

In your cases a conjecture.