Morphology and fsts
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Morphology and FSTs. Morphology is the study of the way words are built up from smaller meaning-bearing units, called morphemes . A morpheme is defined as the minimal meaning-bearing unit in a language. E.g. The word “ gatos ” has two morphemes: “ gato ” and “ -s ” .

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Morphology and FSTs

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Morphology and fsts

Morphology and FSTs

  • Morphology is the study of the way words are built up from smaller meaning-bearing units, called morphemes.

  • A morpheme is defined as the minimal meaning-bearing unit in a language.

    E.g.

    • The word “gatos” has two morphemes: “gato” and “-s”.


Morphology and fsts1

Morphology and FSTs

  • Two important kinds of morphemes are: Stems and affixes.

    • Stem: is the main morpheme of the word, supplying the main meaning.

    • Affixes: add “additional” meanings of various kinds.

  • Affixes are further divided in: prefixes, suffixes, infixes and circumfixes.

    • Prefixes: precede the stem.

    • Suffixes: follow the stem.

    • Circumfixes: do both precede and follow the stem.

    • Infixes: are inserted inside the stem.


Morphology and fsts2

Morphology and FSTs

Examples:

English

“unable” is formed by the prefix “un-” and the stem “able”.

Spanish

“niños” --> stem “niño”, suffix “-s”

“damelos” --> stem “da”, suffix “-los”, infix “-me-”


Finite state morphological parser

Finite State Morphological Parser

  • Features: morphological features specify additional information about the stem (e.g. plural, singular, masculine, feminine, 1ra persona, 2da persona, 3ra persona)


Derivational morphology

Derivational Morphology

Derivation is the combination of a word stem with a grammatical morpheme, usually resulting in a word of a different class.

Common derivations in English

Nominalization is the formation of new nouns from adjectives and verbs.


Derivational morphology1

Derivational Morphology

Adjectives can also be derived from nouns and verbs:


Finite state morphological parser1

Finite State Morphological Parser

In order to build a morphological parser we need at least the following:

  • Lexicon: the list of stems and affixes, together with the basic information about them.

  • Morphotactis: the model of morpheme ordering that explains which classes of morphemes can follow other classes of morphemes inside a word.

  • Orthographic rules: these spelling rules are used to model the changes that occur in a word, usually when two morphemes combine.


Finite state morphological parser2

Finite State Morphological Parser


Finite state morphological parser3

Finite State Morphological Parser

Exercises:

  • Identify the tokens that occur in the following expression (tipical of almost any programming language) and create REs that generate each of them:

    f(x)=3.1416*X08+sin(X08/2.5)[email protected]


Spanish general knowledge quiz 1

Spanish General Knowledge (Quiz 1)

  • Distingue los diferentes monemas:

    • Rehabilitáramos:

    • Expatriación:

    • Pañuelitos:

    • Reforestábais:

    • Antiglobalicacion:

    • Vivificación:


Spanish general knowledge quiz 11

Spanish General Knowledge (Quiz 1)

  • Indica el tipo de lexema que son las palabras de las siguientes frases:

    • El estanque del parque está siempre lleno de pájaros exóticos.

    • A mi amigo Félix le gusta coleccionar cosas raras. Andrés se levantó ayer

    • un poco tarde y Lucía hizo lo mismo.


Spanish general knowledge quiz 12

Spanish General Knowledge (Quiz 1)

  • Indica a qué clase de palabra pertenece cada una de las palabras marcadas en las oraciones:

    • Mi coche es rojo.

    • La rubia era mi prima.

    • Los coches  corrían mucho.

    • Juan y Luis siempre han sido amigos.


Spanish general knowledge quiz 13

Spanish General Knowledge (Quiz 1)

  • Busca el femenino de las siguientes frases:

    • El presidente ecologista

    • El psicólogo dormilón

    • Mi cariñoso jefe

    • El panadero alegre


Spanish general knowledge quiz 14

Spanish General Knowledge (Quiz 1)

  • Este texto periodístico tiene errores: hay adjetivos que deben ir después del sustantivo. Corrígelo. 

    El presidente de G. ha emprendido un largo viaje diplomático por lejanos países, acompañado de su ministro de exteriores asuntos y de su joven esposa. Durante los últimos días se han producido ya numerosas anécdotas. En la inauguración de un industrial edificio, por ejemplo, alguien entregó a la esposa del presidente un redondo objeto que resultó ser un japonés reloj de pared. Pero también ha habido malos momentos. Cuando iban en el oficial coche a la inauguración de un nuevo edificio por una estrecha carretera de montaña, el coche del presidente sufrió un pequeño accidente y chocó contra una vacía casa.


Spanish morphology

Spanish Morphology

For a detailed account of Spanish morphology consult the following page:

  • Universidad de Valéncia, España

    http://mural.uv.es/morfesp/

  • http://www.profesorenlinea.cl/castellano/Analisis_morfologico.htm

  • http://www.vicentellop.com/apuntes_gramatica/apuntes.htm


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