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- My point is, is that...
Some prescriptive guides do not accept this usage,[clarification needed] 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 ..."
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.
The "double is" has been explained as an intensifier or as a way to keep the rhythm of the sentence. Some commentators recommend against using it as a matter of style (not correctness of grammar), because some people find it awkward.
- Zero copula, omission of the copula in some languages or styles
- Pro-drop languages such as Spanish, where subject pronouns are often dropped and implied in their copulas
- Brenier, Jason; Coppock, Liz; Michaelis, Laura; Staum, Laura (2006), "ISIS: It's not a disfluency, but how do we know that?", Berkeley Linguistics Society 32nd Annual Meeting (PDF), archived from the original (PDF) on 2015-05-03, retrieved 2012-10-18
- 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.
- "Grammar Pet Peeves: Huffington Post Readers Pick 7 Really Annoying Language Blunders", The Huffington Post 11/04/2010
- Ltd, Blair Arts. "The ODLT - the Online Dictionary of Language Terminology". www.odlt.org. Retrieved 2019-04-29.
- Fischer, Jordan (September 24, 2013). "The double is". The Noblesville Current. Archived from the original on March 5, 2016. Retrieved April 29, 2019.
- Pelish, Alyssa (2013-09-17). "Are You a Double-Is-er? ". Slate Magazine. Retrieved 2019-04-29.
- Massam, Diane (1999), "Thing is constructions: the thing is, is what's the right analysis?", English Language and Linguistics, Cambridge University Press (3.2): 349