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- 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.
- 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.
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.
- 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, 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.
- 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