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E.  Kinds of Vocabulary
There are several kinds of vocabulary according to several expertises: According  to  the  basis  of  frequency,  vocabulary  can  be  divided  into  two
kinds; there are high frequency vocabulary and low frequency vocabulary. 1.  High  frequency  vocabulary  consists  of  words  that  are  used  very  often  in
normal language, use in all four skills and across the full range of situation of use. High frequency vocabulary consists of 2000 word families, which
are about 87 of the running words in formal written text and more than 95 of the words in informal spoken texts.
2.  The  low  frequency  vocabulary  on  the  other  hand,  covers  only  small proportion  of  the  running  words  of  a  continuous  text,  it  means  that  low
frequency  vocabulary  is  rarely,  used  in  common  activity  of  English language. This group includes well over 100.000 word families.
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Furthermore, Evelyn Hatch and Charly Brown classify the vocabulary into active and passive.
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1.  Active Vocabulary Productive Vocabulary Active  vocabulary  is  word  which  the  students  understand,  can
pronounce correctly, and uses constructively in speaking and writing. It  refers  to  put  item  which  the  learner  can  use  appropriately  in
speaking  or  writing,  and  it  is  also  called  as  productive  vocabulary, although  in  fact  it  is  more  difficult  to  put  into  practice,  its  means  that  to
use the productive vocabulary, the students must know how to pronounce it well, they must familiar with collocation and understand the connotation
meaning of the word. This type is often used in speaking and writing skill. 2.  Passive Vocabulary Receptive Vocabulary
Passive  Vocabulary  is  words  that  recognize  and  understand  when they occur in a context, but which the students cannot produce correctly by
themselves.
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Paul Nation, New Ways of Teaching Vocabulary New York: Teacher of English to Speaker ofAnother LanguageTESOL Inc, 1994, p.3
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Jo Ann Aebersold and Mary Lee Field, From Reader to Reading Teacher, Cambridge: Cambridge University Press, 1997, p. 139
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It refers to language items that can be recognized and understood in the context of reading or listening and also called as receptive vocabulary.
Fries said vocabulary consists of two, namely; function and content word. 1.  The function words are a closed class, we cannot add to the preposition or
auxiliaries or modals or any structure word of language. 2.  The content words, on the other hand,  can be added to  any times as new
scientific  advances  make  new  words  and  communication  about  new inventions necessary.
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F.  Principles in Teaching Vocabulary