I'm quite confused with the use of "would". Confusing use of would is below:
You use you would in negative sentences with verbs such as 'guess' and 'know' when you want to say that something is not obvious, especially something surprising.
⇒ Chris is so full of artistic temperament you'd never think she was the daughter of a banker.
⇒ Inside, he admits, his emotions may be churning, but you would never guess it.
What I'm confused(not understood) is as follows:
Why 'would' has been used in those examples? I don't know how to use 'would' in this way. Could you please interpret it?