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本文是一篇英语教学论文发表，本研究的贡献总结如下：（1）本文基于认知语言学中语言的象似性的各个原则探究左移位构式的认知动因，为左移位构式的研究提供了认知层面的新视角。（2）本文通过对左移位构式这一普遍却具有标记性结构的象似性分析，丰富了象似性的适用性。

Chapter One Introduction

1.1 Research Background

In English,dislocations can be divided into two categories:left dislocations andright dislocations.A dislocated structure in English is a pronounced instance when acommitted noun phrase is present at both the start and conclusion of a sentence and anemerging co-index pronoun appears in the matching location.In earlier studies ofdislocations,researchers used generative grammar to examine the interior linguisticrelationships of dislocated sentences and to dig into their internal languagerelationships in an effort to generalize the rules governing these sentimentalphenomena.Even when the interpretation of subjectivity is taken into account,thestudy of dislocation traditionally tries to show linguistically factors involved in thechanging of the sequence of sentimental components rather than extra-linguistic factors,especially cognitive factors.

The left dislocation construction is a structure first studied and named by Ross(1967),and is considered to be derived from its regular word-order sentence.As shownin the following examples

(1)a.Many of our classmates would like to choose French as a second language.

b.French,many of our classmates would like to choose as a second language.

c.French,many of our classmates would like to choose it as a secondlanguage.

1.2 Research Questions

This thesis contributes to illustrating the cognitive motivation of left dislocationconstruction through the following two research questions.

Firstly,what representation does left dislocation construction have from theperspective of iconicity?

Secondly,what is the cognitive motivation of left dislocation construction fromthe perspective of iconicity?

The author has read lots of books and papers about left dislocation construction,iconicity in language and cognitive motivations,and finds that the principles ofsequence,quantity,distance and markedness are suitable for exploring the cognitivemotivation of left dislocation construction.Therefore,the cognitive motivations of leftdislocation construction will be found out from the perspective of iconicity.

Chapter Two Literature Review

2.1 The Main Features of Left Dislocation Construction

Due to the point above,the form of left dislocation construction can beschematized as“XP+NP+VP+YP”,in which XP is the left dislocation constituent,while YP occupies the original position of XP.In the left dislocation construction,thedislocated constituent must be moved forward to the left to the beginning of thesentence,and there must be a co-reference relationship between XP and YP,that is,XPand YP refer to the same object or thing.

2.1.1 The Syntactic Features of LDC

According to the form of left dislocation construction and the principles it follows,the following sentences can be defined as left dislocation construction.

(2)a.Lisa,I saw her last night in the cinema.

b.小李，我上周和他一起去了北京。

c.In 1998,I was born then.

d.On the table,he put the books there.

e.北京，我曾和小李去过那儿。

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