Well, typically used to express exasperation, a matter-of-fact or unenthusiastic attitude, or helpless acceptance of something surprising.
Expression used to imply meaning, rather than say it, such as when a person is embarrassed.
Used other than figuratively or idiomatically: see you, know.
Expression signifying a pause or hesitation.
Used as a rhetorical question to confirm agreement, knowing or understanding at the end of a statement.
Used to introduce information.