The word "is" is the main verb of this sentence. It's a form of the verb "to be" and can be used as a linking verb (as in this sentence) or as an auxiliary verb.
http://grammar.ccc.commnet.edu/grammar/to_be.htm
catching fish (is)one of the oldest pastimes. The word(is) is ither a verb adverb preopstion or conjunction i cant tell which one?
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