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1、句子语义学词和词之间有各种各样的意义关系,我们称之为senserelation。句子也一样,可以有各种意义关系。句子语义学是在句子层面对意义进行研究,并把句子当成一个整体来看待。◆Presupposition前提/预设,这一概念是由哲学家弗雷格(G.Frege)首先提出来的。在言语交际中,我们所说的一句句话并不是孤立的,相互之间毫无联系的。相反前一句话和后一句话往往有密切的联系。Pleaseopenthedoor.这句话的意思很清楚,就是“请把们打开”,但是说这句话必须有一个前提,那就是“现在要开的
2、门再说话时是关着的”。所以从语义的角度来看,句子所包含的“前提”和这个句子本身的意义有十份密切的关系句子的前提有这样的特点:否定了句子本身,句子的前提保留不变。Johnismarried.Johnexists.Johnisnotmarried.◆Semanticpresuppositionandpragmaticpresupposition语义预设是对语句之间关系所做的逻辑分析,他面对的是一种不变的关系:即如果P在语义上预设Q,则P总是在语义上预设Q。但在实际的语言活动中(语用预设),预设通常不是语
3、义中稳定的不受约束的部分。这也正是有些语言学家认为预设属于语用学而不属于语义学的主要原因。一个重要的事实是,在一定的语境里,预设会消失,也就是说预设具有可消失性(defeasibility)。例如:Suecriedbeforeshefinishedherthesis.Suediedbeforeshefinishedherthesis.◆WhatisSemanticPresupposition?Inmanydiscussionsoftheconcept,presuppositionistreateda
4、sarelationshipbetweentwopropositionsbythelinguists.Ifwesaythesentencein(1a.)containsthepropositionpandthesentencein(1b.)containsthepropositionq,then,using>>tomean‘presupposes’,wecanrepresenttherelationshipasin(1c.).(1)a.Mary’sdogiscute.(=p)b.Maryhasado
5、g.(=q)c.p>>qInterestingly,whenweproducetheoppositeofthesentencein(1a.)bynegatingit(=NOTp),asin(2a.),wefindthattherelationshipofpresuppositiondoesnotchange.Thatis,thesamepropositionq,repeatedas(2b.),continuestobepresupposed资料byNOTp,asshownin(2c.).(1)a.M
6、ary’sdogisn’tcute.(=NOTp)b.Maryhasadog.(=q)c.NOTp>>qPresuppositionisaninference(推论)tothepropositionofthesentence.Takethefollowingsentencesforexampleagain:e.g.(3)Johnismarried.(4)Johnexists.(5)Johnisnotmarried.Comment:if(3)istrue,(4)istrue;if(3)isnottru
7、e,(4)isstilltrue.Inthiscase,wecansayboth(3)and(5)presuppose(4).Apresuppositionissomethingthespeakerassumestobethecasepriortomakinganutterance.Speakers,notsentences,havepresuppositions.Anentailmentissomethingthatlogicallyfollowsfromwhatisassertedintheut
8、terance.Sentences,notspeakers,haveentailments.◆Semanticpresuppositionwouldbebasedonthefollowingdefinition:SentenceAsemanticallypresupposesanothersentenceBiff:ifandonlyif,iff是充分必要条件(a)inallsituationswhereAistrue,Bistrue(b)inallsituations