In terms of events it expresses:
- The place where the event occurs (question word - where?)
- The manner in which the event occurs - how?
- The time at which the event occurs. when?
- The duration of the event; how long?
- The number of occurrences of the event - how many times?
- The frequency that the event occurs - how often?
- The reason why the event occurs; why?
- The degree to which something occurs - how much?
- The result of the event. (no question word in English).