I'm used to seeing modal verbs followed by auxiliary verbs, like this:
I should have been reading.
However, I've heard people say things like:
I'm glad you did or I wouldn't met you.
I knew we shouldn't trusted him.
Is this construction without the auxiliary informal?
Is there a difference if I rewrite those sentences as:
I'm glad you did or I wouldn't have met you.
I knew we shouldn't have trusted him.