What are the modifiers used to modify S, V and O?

  a. The subject in a sentence is always a noun,  a noun phrase or

       a noun clause.

      In English, adjectives, adjective phrases and adjective clauses are

      used to modify the subjects.

  b. The verb in a sentence can be a single verb or a verb phrase.

      They will be modified by adverbs, adverb phrases and adverb

      clauses.

 c. The object is also in a form of noun in an English sentence.

    Therefore, adjectives, adjective phrases and adjective clauses are

     used to modify the objects.