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The double copula, also known as the reduplicative copula, double is or Isis,〔 Brenier, Jason M. and Laura A. Michaelis. 2005. Optimization via Syntactic Amalgam: Syntax-Prosody Mismatch and Copula Doubling. ''Corpus Linguistics and Linguistic Theory'' 1: 45-88.〕 is the usage of two successive copulae when only one is necessary, largely in spoken English. For example: :''My point is, is that...'' This construction is accepted by many English speakers in everyday speech, though some listeners interpret it as stumbling or hesitation,〔http://www.umanitoba.ca/linguistic_circle/e_journal/v2009_1Bakke.pdf〕 and others as a "really annoying language blunder".〔("Grammar Pet Peeves: Huffington Post Readers Pick 7 Really Annoying Language Blunders" ), ''The Huffington Post'' 11/04/2010〕 Some prescriptive guides〔http://www.odlt.org/ballast/double_copula.html〕 do not accept this usage, but do accept a circumstance where "is" appears twice in sequence when the subject happens to end with a copula; for example: :''What my point is is that...'' In the latter sentence, "What my point is" is a dependent clause, and functions as the subject; the second "is" is the main verb of the sentence. In the former sentence, "My point" is a complete subject, and requires only one "is" as the main verb of the sentence. Another example of grammatically valid use of "is is" is "All it is is a ..." Some sources describe the usage after a dependent clause (the second example) as "non-standard" rather than generally correct.〔http://currentnoblesville.com/the-double-is〕〔http://www.slate.com/blogs/lexicon_valley/2013/09/17/double_is_why_linguists_think_we_sometimes_double_up_on_is_in_a_setup_payoff.html〕 ==Words other than "is"== The term ''double is'', though commonly used to describe this practice, is somewhat inaccurate, since other forms of the word (such as "was" and "were") can be used in the same manner: :''The problem being, is that...'' According to the third edition of ''Fowler's Modern English Usage'' (as revised by Robert Burchfield), the double copula originated around 1971 in the United States and had spread to the United Kingdom by 1987. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Double copula」の詳細全文を読む スポンサード リンク
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