Adverbs of Manner express how an action is done.
  The birds sang sweetly. Henry dances well. He speaks to me in a friendly way.
Adverbs of Time express when an action is done.
  I will do the work tomorrow. Call me early. He met her yesterday.
Adverbs of Place

express where an action is done.

  He will wait here. Perhaps they are at school. Mary’s uncle is in hospital.
Adverbs of Frequency

express how often an action is done.

  They sometimes stay up all night. He is always in time for meals.
He can never understand.