浙江大学肖忠华语料库session(外语学习)-精选课件(设计).ppt

Exploring existing English corpora To learn how corpora can be classified To learn about design decisions in creating different kinds of corpora To become familiar with a range of well-known and influential corpora Types of corpora, different uses General vs. specialized corpora Written vs. spoken corpora Synchronic vs. diachronic corpora Monolingual vs. multilingual corpora Comparable vs. parallel corpora Native vs. learner corpora Developmental vs. learner corpora Raw vs. annotated corpora Sample vs. monitor corpora … Monitor corpora Constantly updated and growing in size Much larger corpus size Often contain full text Always up-to-date Often only admit new material which has new features not already in corpus Used to track changes across different periods of time Monitor corpora could be a series of static corpora Disadvantages No attempt to balance the corpus Text availability can become an issue (e.g., copyrights) Confusing to indicate specific corpus version Cannot easily compare results run on corpora of different sizes Some well-known English corpora The British National Corpus (BNC) The Bank of English (BoE) BYU American English corpus Corpora of the Brown family (Brown, LOB, FLOB, Frown) ICE corpora (GB, EA, HK, Singapore, Philippines, New Zealand etc) London-Lund corpus of spoken English SBCSAE The Helsinki Diachronic Corpus of English Texts (8th - 18th Century, ca. 5 million words) The International Corpus of Learner English (ICLE) MICASE The BNC First and best-known national corpus (sample corpus) 100 M word balanced corpus of written (90%) and spoken (10%) British English in current use 1960 - earlier 1990s Rich metadata encoded for language variation studies POS tagged Accessing the BNC BYU-BNC: /bnc/ BNC Online: http://www.natcorp.ox.ac.uk/getting/index.xml.ID=order_online Lancaster BNCWeb CQP edition http://bncweb.lancs.ac.uk/bncwebSignup/user/login.php BNC Baby: http://www.natcorp.ox.ac.uk/corpus/baby/index.html Sketch Engine: http://www.sketc