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(1)bad:-adjective:-She is having a really bad day.
----------- adverb:-She wanted (the president post) real bad (=badly)
------------adverb:-Are you (P) and (?) hurt bad?(=badly)
(2)fast:-adj:-She is a fast learner in English.
----------------I am early---my watch must be fast.My watch is 15 minutes fast.
(2)fast (adverb):---Don't drive so fast ! How fast are you going now?She can't go any faster.The river was rising fast in the road. The police said that they had reacted as fast as they could. Her heart beat faster and died.