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htm In future, please do not post in all-capital letters.
- htm In future, please do not post in all-capital letters.
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I don't know what you mean by 'referent', but you can begin by reading about those two auxiliary verbs at these links:
http://library.bcu.ac.uk/learner/Grammar%20Guides/3.07%20Modals.htm
http://library.bcu.ac.uk/learner/Grammar%20Guides/3.07%20Modals.htm
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