Ambiguity and Transformations

Slides:



Advertisements
Similar presentations
Tree Diagrams / Labelling Phrases
Advertisements

Ambiguity & Transformations
Intro to NLP - J. Eisner1 Modeling Grammaticality [mostly a blackboard lecture]
Lecture 7 Syntax Transformations.
Techniques of Grammatical Analysis
Language and Cognition Colombo, June 2011 Day 2 Introduction to Linguistic Theory, Part 4.
Long Distance Dependencies (Filler-Gap Constructions) and Relative Clauses October 10, : Grammars and Lexicons Lori Levin (Examples from Kroeger.
Syntax: The Sentence Patterns of Language
Analysing Syntax 1 Lesson 8B.
SYNTAX Introduction to Linguistics. BASIC IDEAS What is a sentence? A string of random words? If it is a sentence, does it have to be meaningful?
Phrase Structure Rules Must allow all and only the grammatical sentences in a language Descriptive rules, not necessarily prescriptive Each rule “rewrites”
The study of how words combine to form grammatical sentences.
Syntax: The Sentence Patterns of Language Deny A. Kwary Airlangga University.
Matakuliah: G0922/Introduction to Linguistics Tahun: 2008 Session 11 Syntax 2.
Phrase Structure Rules
Syntax: The analysis of sentence structure
1 CSC 594 Topics in AI – Applied Natural Language Processing Fall 2009/ Outline of English Syntax.
LI 2013 NATHALIE F. MARTIN S YNTAX. Table of Content I. Grammatical vs. Ungrammatical Grammatical vs. Ungrammatical II. The Sentence The Sentence III.
Syntax: Part II More Structures.
Theories of Linguistics Developer TraditionalPlato to Aristotle StructuralLeonard Bloomfield Ferdinand de Saussure Prague TransformationalNoam Chomsky.
Dr. Ansa Hameed Syntax (4).
Syntax The analysis of sentence structure
Syntax: The analysis of sentence structure
Generative grammar Lynn W Zimmerman, PhD. Generative grammar  Chomsky – 1950s  Finite number of rules controlling how sentences can be formed.
Syntax Nuha AlWadaani.
LI 2013 NATHALIE F. MARTIN S YNTAX. Grammatical vs Ungrammatical.
Creativity of Language
Chapter 4 Syntax Part II.
Introduction to Linguistics
1.Syntax: the rules of sentence formation; the component of the mental grammar that represent speakers’ knowledge of the structure of phrase and sentence.
Related Sentences The boy is sleeping. Is the boy sleeping? The boy can sleep. Can the boy sleep? Mary picked up the book. Mary picked the book up. Mary.
CS : Speech, Natural Language Processing and the Web/Topics in Artificial Intelligence Pushpak Bhattacharyya CSE Dept., IIT Bombay Lecture 12: Deeper.
“Any speaker of any human language can produce and understand an infinite number of sentences.” Fromkin, Victoria, Robert Rodman & Nina Hyams An.
IV. SYNTAX. 1.1 What is syntax? Syntax is the study of how sentences are structured, or in other words, it tries to state what words can be combined with.
Natural Language Processing Lecture 6 : Revision.
1 Chapter 4 Syntax The sentence patterns of language Part I.
Introduction to English Syntax
Syntactic Rules Must Account for the Following  The grammaticality of sentences  Word order  Hierarchical organization of sentences  Grammatical relations.
Today Phrase structure rules, trees Constituents Recursion Conjunction
Chapter 4: Syntax Part V.
PARSING David Kauchak CS159 – Spring 2011 some slides adapted from Ray Mooney.
ENGLISH SYNTAX Introduction to Transformational Grammar.
1 Prof.Roseline WEEK-4 LECTURE -4 SYNTAX. 2 Prof.Roseline Syntax Concentrate on the structure and ordering of components within a sentence Greater focus.
Creativity of Language
 The grammaticality of sentences  Word order  Hierarchical organization of sentences  Grammatical relations  Structural ambiguity  Different structures.
Syntactic Rules Must Account for the Following  The grammaticality of sentences  Word order  Hierarchical organization of sentences  Grammatical relations.
Review of basic concepts.  The knowledge of sentences and their structure.  Syntactic rules include: ◦ The grammaticality of sentences ◦ Word order.
Rules, Movement, Ambiguity
Natural Language Processing
Making it stick together…
1 Syntax 2. 2 Now let’s change the NP rule again Such that we have – S  NP VP – VP  V NP – NP  (DET) (ADJ) N Now you can diagram this sentence – The.
1 Natural Language Processing Lectures 8-9 Auxiliary Verbs Movement Phenomena Reading: James Allen NLU (Chapter 5)
SYNTAX.
◦ Process of describing the structure of phrases and sentences Chapter 8 - Phrases and sentences: grammar1.
CS460/IT632 Natural Language Processing/Language Technology for the Web Lecture 13 (17/02/06) Prof. Pushpak Bhattacharyya IIT Bombay Top-Down Bottom-Up.
3.3 A More Detailed Look At Transformations Inversion (revised): Move Infl to C. Do Insertion: Insert interrogative do into an empty.
The final chapter.  Constituents ◦ Natural groupings of a sentence  Morphemes ◦ Smallest meaningful units of a word  How to test whether a group of.
CS : Language Technology for the Web/Natural Language Processing Pushpak Bhattacharyya CSE Dept., IIT Bombay Parsing Algos.
(Transformational) Generative Grammar
Welcome to the flashcards tool for ‘The Study of Language, 5 th edition’, Chapter 8 This is designed as a simple supplementary resource for this textbook,
Chapter 4 Syntax a branch of linguistics that studies how words are combined to form sentences and the rules that govern the formation of sentences.
Syntax 2.
SYNTAX.
Lecture 4b: Verb Processes
4.3 The Generative Approach
Chapter Eight Syntax.
PHRASE STRUCTURE RULES
Syntax: The Sentence Patterns of Language
Chapter Eight Syntax.
Introduction to Linguistics
Presentation transcript:

Ambiguity and Transformations Deny A. Kwary http://www.kwary.net Airlangga University Ambiguity and Transformations

Ambiguity: a word, phrase or sentence with multiple meanings (p. 122) Synthetic buffalo hides (NP) Synthetic buffalo hides (NP) Synthetic buffalo hides Synthetic buffalo hides Buffalo hides that are synthetic. Hides of synthetic buffalo.

Ambiguities often lead to humorous results For sale: an antique desk suitable for lady with thick legs and large drawers.  what does “thick legs and large drawers” refer to? The desk or the lady?

Structural Ambiguity (pp Structural Ambiguity (pp.143-144) The boy saw the man with the telescope S NP Aux VP Det N V NP PP Det N P NP Det N The boy past saw the man with the telescope

Structural Ambiguity (pp Structural Ambiguity (pp.143-144) The boy saw the man with the telescope S NP Aux VP Det NP N V Det N PP P NP Det N The boy past saw the man with the telescope

Exercise # 4 p.166

Consider the following sentences: Susie had a shower after she got up. After she got up, Susie had a shower. After Susie got up, she had a shower. She had a shower after Susie got up. Do the four sentences above contain the same words? Yes, they do In which sentences can the pronoun ‘she’ probably refer to Susie? Sentences #1, 2, & 3 The rule: An anaphor many not both precede and command its antecedents

What does it mean? Jan and Larry drank whisky and sherry with respect. Jan and Larry drank whisky and sherry, respectively Jan and Larry drank whisky and sherry with respect. Jan drank whisky and Larry drank sherry.

Transformation: A special type of rule that can move an element from one position to another Several types of transformations Declarative – Interrogative Active – Passive There sentences PP preposing

Declarative – Interrogative Move the auxiliary to the left of the subject. The boy will leave. S Will the boy leave? S NP Aux VP Aux NP VP Det N V Det N V The boy will leave Will the boy leave The deep structure The surface structure

The Wh Movement S NP Aux VP Det NP N V Det N The man should repair Surface structure: Which car should the man repair? Deep structure: S NP Aux VP Det NP N V Det N The man should repair which car

Draw the deep structure of the following sentences Will the boss hire Hillary? Is that player leaving the team? Who should the director call? What is Joanne eating?

The syntactic rules in a grammar account for at least: The grammaticality of sentences Word order Hierarchical organisation of sentences Grammatical relations such as subject and object Whether different structures have different meanings or the same meaning The creative aspect of language

That’s All For Today See You Next Week Deny A. Kwary http://www.kwary.net Airlangga University That’s All For Today See You Next Week