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For a brief summary of double modal usage in Southern American English and a discussion of its possible sources, please refer to my miscellany article in the most recent edition of American Speech and the works cited in it. Full details: Barbara A. Fennell (1993) 'Evidence for British Sources of Double Modal Constructions in Southern American English.' AMERICAN SPEECH, 68.4. pp. 430 - 438. Barbara Fennell North Carolina State UniversityMail to author|Respond to list|Read more issues|LINGUIST home page|Top of issue
In response to Tom King's posting, I confess that I feel a bit uneasy hearing "could" described as having indicative vs. subjunctive senses. For one thing, I take this mood distinction, at least as reflected in English, to involve subcategorization by some higher predicate (e.g. 'demand that he leave') or other other operator taking scope over it (e.g. 'if she were to leave')--note that these are two different notions, or realizations, of 'subjunctive'. In any case, subjunctive is a grammatical category and does not correspond to a constant 'sense'. I would be more comfortable with the standard terminology of modality, in which 'could' would be described as having an epistemic sense or use (He could be there now, for all I know), a root meaning as the past of 'can' (She could run a 4 minute mile in her younger days) that expresses potentiality or physical possibility, and a deontic meaning (as in the sequence of tense example She said that you could come). These understandings (i.e. senses or uses, depending on the analysis) thus correspond respectively to 'it is possible that...', 'it was possible for...' or 'NP was able to...', and 'it was permitted for...'/'NP was permitted to'. That-all aside, my own informant work on double modal dialects in Texas and Arkansas is consistent with Tom King's finding. Specifically, may/might can occur ONLY as the FIRST modal in a sequence, and always with the epistemic meaning 'maybe', 'it is possible that'. On the other hand, can/could ONLY occurred as the LAST modal in a sequence, and always with a root or deontic meaning involving ability or permission. The maximum number of modals in attested sequences was three, and 'should' and 'will' were found in addition to the others. Thus, He'll can come. 'He will be able to come' You might should come. 'Perhaps you should come' You might could be right. and so on. It's nice to know these constructions have roots in the sod of the old country. Larry HornMail to author|Respond to list|Read more issues|LINGUIST home page|Top of issue
The President of the United States uses double modals. --Natalie (maynorMail to author|Respond to list|Read more issues|LINGUIST home page|Top of issuera.msstate.edu)