on(p)

in operation or operational

"left the oven on"; " the switch is in the on position"

(of events) planned or scheduled

"the picnic is on, rain or shine"; " we have nothing on for Friday night"

adv.
with a forward motion

"we drove along admiring the view"; " the horse trotted along at a steady pace"; " the circus traveled on to the next city"; " move along"; " march on"

同义词：along

indicates continuity or persistence or concentration

"his spirit lives on"; " shall I read on?"

in a state required for something to function or be effective

"turn the lights on"; " get a load on"