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Alexander, L.G. (1992).  Longman English Grammar Practice for Intermediate Students. 
            Essex: Longman Group UK Limited.
Azar, Betty Schrampfer.  (1993).  Understanding and Using English GrammarChartbook:
            a Reference Grammar. Second Edition.  Englewood Cliffs.  New Jersey:  Prentice Hall,
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Blundell, Jon, Higgens, Jonathan and Middlemiss, Nigel. (1982).  Function in English.  Oxford:
            Oxford University Press.    
Spankle, G.M.  (1987).  The Grammar You Need.  London and Basingstoke: Macmillan
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Swan,  Michael. (1981).  Practical English Usage.  Oxford: Oxford University Press.
____________.  (1985).  Basic English Usage.  Oxford: Oxford University Press.
Thomson, A.J. and Martinet, A.V.  (1989).  A Practical English Grammar.  Fourth Edition.
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Vince, Michael and Emmerson, Paul.  (2003).  English Grammar and Vocabulary:
            Intermediate Language Practice.  Oxford: MacMillan.