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Ifweweretoexaminethestudent’sEnglishandlistentothemspeakinginEnglish ,andlookthroughtheircompositionsweshouldfindthatthesamemistakesofpronunciation ,spellingandgrammarweremadebydifferentindividuals.Weshouldprobablybeabletoidentifythemothertongueinterferenceonlybasesontherecurringmistakeshemade .Wecouldeasilyrecognizetheaccentofapersonwhospeaksourmothertongue,andwecouldalsoeasilyfindtraceofmothertongueinhissecondlanguageacquisition .Thereforewhenwelookatthespeechandwritingofthesecondlanguagelearnerwewillfind...