The word classes which have not been dealt with in the previous two chapters are adverbs, conjunctions, prepositions and interjections. Of these the adverb is probably the most important, and certainly the most difficult. Its importance reflects the fact that it is the only one of these remaining classes which belongs to the open category of words and which can act as an independent unit within the structure of a sentence. Its difficulty springs from the heterogeneous nature of the adverb and from the similarity in function which many adverbs have to words in other classes. Perhaps we may consider this latter difficulty first.
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