To talk about a subject frequently or at great length.
To proceed.
To use and adopt (information) in order to understand an issue, make a decision, etc.
To happen (occur).
To continue an action.
To continue in extent.
I think I've said enough now; I'm not sure I should go on.
Expressing that the speaker can continue speaking without interruption from the listener.
Expressing surprise, disbelief or incredulity.
Expressing encouragement, see come on.
To hold forth about something in an opinionated manner.
Command instructing a person to confirm that they are present or that some other objective has been met.
Command instructing a person to speak up or acknowledge something.