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1、AbstractWiththedevelopmentofCognitiveLinguisticsandothersciences．t11e_k110wle她eaIldunderstandingabouthumancognitiveabilitieshaveimprovedgreatlv．Jneco鯽1tlveanalysisofEnglishExistentialSentences，especiallyThere-be∞ns蟣1ctlon，hasbeenahotissue．Asacomn20nbutspeciallinguisticphenomenon’There-beconst
2、ructionhasattractedmoreandmoreattention．EngllsheXistentialsentences，especiallyThere·beconstruction，isconceivedofaublqul‘ou8pheilomenonoccurringinalmostalltheworldlanguages(Frezz，1992)．HoweV％malnlYowhagtoitsperplexinggrammaticalandcontextualfeanlres．for甑鋤ple，thedefinitenessofNP,theunaccusitive
3、ofthev砷a11dsofonh，it，sbeeIltm(enasoneofthebrain‘rackingissues，confusingthelinguisticresearchers．matmakesitmorecomplicatedareitsvariousrepresentativefomsinThere-beconstmction·Historically,therearethreemainapproacheshavingmadecon／ributionStothes伽yofthisissue,whicharedescriptive，generativeandfun
4、ctionalapproaches．But1t’8unfortunatethatthesemethodscouldnotfullyexplainthislinguisticpnenomenonandmanagetoreachsomewhatfeasibleresultsbecauseoftheirowninherentinadequacies．[histhesisattemptstoexploreThere—beconstructioninEnglishExistentialsentencesbYmeansofCognitiveGrammaticaltheories，suchas
5、iconicprinciples．co印1tiVegr鋤maticalizationandsomeotherprinciples．Thegoalsoftheresearcharem81niytound铘tandthegenerationofThere—beconstructioninEnglishExistentialsentences，tofindtheinvisibleCognitivemotivationsofthedevelopmentandexpansionofitforitsspecificityandparticularity．MoreoVer,thedlsCtis
6、sionsandresearchesofthisthesiswillmainlybefocusedonthefollowingtwoquestions：【1)WhatarethedistributivecharacteristicsoficonicforrningprinciplesreflectedOnthebasiclinguisticstructuresofThere．6econstmction?(2)Howdotheseformingprinciplesembodiedin乃e倍鈀constructionAndHowtocont曲utetotherealizationof
7、theWorkingorCognitiveMechanisms舶mbasicconstructionstothevariantstructllres?上"hroughthediscussionandanalysis，severalconclusionscouldbemadeas(1)Iconicprinciplesandgrammaticalizationareofmentalprocessingrammaticalconstructionsbothofnaturallangua
