Go-Onward = take action, going to do, proceed
Constant-Onward = keep on, lasting, constant, continue 
Progress-Onward = ongoing, progress

Go-Onward Examples
They are going to clean.
Let’s do the game.

Constant-Onward Examples
They keep cleaning.
The game is on.

Progress-Onward Examples
They are cleaning.
The game will be go on.