“…Different research studies have shown that formal grammar instruction can: (a) have no apparent effect on language acquisition (Carroll, 1964;d'Anglejan, 1978;Dulay & Burt, 1973;Harley, 1989;Perkins & Larsen Freeman, 1975; The Modern Languugz Journal, 79, iii (1995) "1995 The Modern Languagz Journal 0026-7902/95/329-355 $l.50/0 Saegert, Scott, Perkins, & Tucker, 1974); (b) be unnecessary for language acquisition (Edwards, Wesche, Krashen, Clement, & Kruidenier, 1984;Hammond, 1988;Lafayette & Buscaglia, 1985;Terrell, Gomez, & Mariscal, 1980); (c) have positive effects on language acquisition (Doughty, 1991;Eckman, Bell, & Nelson, 1988;Harley, 1989;Hulstijn & Hulstijn, 1984;Long, 19831;Pica, 1983;Pienemann, 1989;VanPatten & Cadierno, 1993); (d) have detrimental effects on language acquisition (Pienemann, 1989); and (e) (when absent) have negative effects on language acquisition (Higgs & Clifford, 1982). Similar contradictions appear in research on error correction.…”