1. literature review
1.1 Original Perspective
Philosophy and logic look the relationship between modality and objective truthvalue. Possibility and necessity are the core conceptions in traditional study of modallogic. In logic，modulation that belongs to philosophical categoiy refers to possibilityand necessity of things or event, and also refers to speaker's subjectivity toward theproposition's truth value and the state of reality. Modal encompasses narrow modal andextended modal，the former only includes propositions of necessity and possibility,while the latter, embodies more modal relationships，such as necessity, obligation，permission, prohibition etc. And those relationships of modal belong to epistemic anddeontic study separately. Aristotle put up and defined four logical operators of necessity,possibility, accident and impossible. He also studied modal words and modal syllogism.What promotes the logic of modality is the foundation of the mathematical logic-basedmodem logic of modality in the early 20th century and classification of extended logic.Modal logic is not only the judgment toward possibility and necessity of things，but alsothe base of modal inferences.This period was the early stage of study on modality, and the study was notsystematic.
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1.2 Traditional Perspective
From the time that 2017 years ago Aristotle studied modal to the middle 20th century,this period is call the traditional study of modality. In this period, linguistics underwentvarious developing stages，and each linguistic school had researched modals，and schoolof classical grammar and that of structuralinguistics interpreted from the perspectives ofgrammatical structures and semantics. Here, traditional study of modality refers thestudies of traditional grammar, structualinguistics, TG grammar and classical semantics.Jesperson discusses modality under the category of mood，英语论文题目，and then he defined thismodality. He examined three kinds of mood: indicative mood, subjunctive mood andimperative mood. But these moods do not represent the relations between subjective andpredicative; they represent certain attitude of speakers towards the content of sentences.Yet, Jesperson views mood and modality as a same category flinging into confusion,and the confusions still confuse the linguists who study mood and modality up to now.Structuralism studies modality under the category of auxiliary. Auxiliaries are dividedinto basic auxiliary, modal auxiliary and semi-auxiliary. The structural school examinesthe parts of speech of modal auxiliary as auxiliary verbs from the perspective ofdivision and distribution. And the structuralism also discusses the position and functionof modal auxiliaries in positive, interrogative, and negatives sentences; together with theparticularities in modal auxiliary's syntactic behaviors. Structuralism focused theirattention on the meanings of modal auxiliaries too, and divided the meanings into threegroups: permission and possibility; obligation and necessity; volition and prediction，英语论文题目，and they also held that these meanings correspond to intrinsic or extrinsic modality.(Quirk，1985:219-221)
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Chapter 2 Theoretical Base
2.1 Overview
Previously, I made a survey on several views of modal study of different linguisticschools，in which the most novel study
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