Januari 10, 2010

This thesis is aimed at identifying the students’ vocabulary mastery based on kinds of affix in the derivation words in enriching vocabulary that is the noun suffix, the adjective suffix, the adjective prefix, the verb prefix, the verb suffix and the negative prefix. Considering this aim, the writer uses an analytic method whish actually belongs that is, to what extent the students master vocabulary and which kinds of affix is the most difficult and which one is the easiest.
The population of the research is the eleventh year students of SMA Negeri 2 Surakarta, Academic Year 2007/2008. The writer uses random sampling in choosing her sample. She takes 39 students out of the 400 students. In collecting the data, the writer uses a test as the research instrument.
The result of the shows that the students’ vocabulary mastery is fair, as shown by their average score, that is, 72,37%. Out of the 39 students tested , 3 students got excellent score (A), 9 students got good score (B), 19 students got fair score (C), 5 students got bad score (D) and the last, 3 students got poor score (E).
The total of incorrect answers made by the students are 431 or 27,63% which consist of 140 or 20,86% in the noun suffix, 166 or 32,28% in the adjective suffix, 20 or 26,03% in the adjective prefix, 49 or 31,58% in the verb prefix, 8 or 20,90% in the verb suffix, and 48 or 38,85% in the negative prefix. It shows that the negative prefix is the most difficult and the noun suffix is the easiest one.

Language as a mean communication seems to have played an important role in human life. Language and human beings can not be separated. Human life perspectuity can run well because they use language to communicate something one another. Through the language, people gain a better insight into human relations. They use the language to express their ideas and thoughts. Meanwhile language itself can survive and develop because people use it and teach to other people. Whoever, whenever and wherever they are, language always accompanies them. Even when one is silent, basically he still uses language it is a means used to form thought and feeling, will and activity.
English has important role in the world. The different growth of languages makes it the most popular among the other international languages. Nowadays, there are no part of the world affairs know nothing about English. International affairs such as education, economic, sport, science, medicine, and security, always involve English as the medium. Besides, it must be realized that most scientific books are written in English. Accordingly, in order to be able to comprehend the books for getting knowledge, one must have mastery in English and so must the Indonesian students.
For Indonesia, English is a foreign language. With this position, it does not have social function as wide as a second language. English in academic field is taught as a subject matter. By learning English the learners are hoped to be able to communicate about anything in English. It is in accordance with River’s statement that the final aim of teaching a foreign language is to produce students who can communicate about anything and everything in the foreign language.
To achieve the communicative function, we need general knowledge and skill of English and language components. There are four language skills taught in SMA. They are listening, speaking, reading, and writing. Reading gets more emphasis than the others. This emphasis is reasonable, as the graduates of SMA are prepared to continue their study to university in which most reference books are written in English. Furthermore, vocabulary knowledge is basic to and primarily the prime ingredient in comprehension. Strategy for vocabulary development is essential element of any reading program (Robinson, 1978:p.8). The language components involve vocabulary, grammar, and pronunciation. In fact, all language components are important, but the most important one in language teaching is vocabulary, as Coleman says, that vocabulary is the most important component in language teaching. By having an adequate mastery of vocabulary, students can learn language more easily. Besides, there is a direct relationship between a successful career and large vocabulary. Men and women who had achieved distinction in variety of field were proved to have vocabularies larger than the average. It does not mean that a large vocabulary can guarantee one to become a scientist. But it means that inadequate vocabulary will minimize one’s chances for success; an effective vocabulary will increase them.
Vocabulary can be defined as a list words, usually in alphabetical order and with explanations of their meanings, less complete than a dictionary (Paul P, 1978: p.1229). Meanwhile, a word has three aspects; their form, their meaning, and their distribution. Therefore, in language teaching, a teacher must as the consider the three aspects. A teacher must consider the meaning of the language as the student will not automatically understand the meaning of the language without being taught though they have mastered the structure of the language. The meaning also can be grasped through the context, form, and association.
When we talk about the process of mastering vocabulary, we have to deal with the ways of enriching vocabulary. If the students could master and always remember all the vocabularies learned at school, when they have graduated their vocabulary of English would be adequate enough. After they have finished their study at SMA, however, it turns out that they just loose too many of their English words, only a very limited number are remembered. This, of course, will not apply to those who take English Department in the university. It is one of the phenomena happening in the process of mastering vocabulary in SMA today. To know more about how students master the vocabulary the writer will have a look for at the mastering of derivation words that can be used to enrich vocabulary. Because without knowing the derivation of the words the students will be confused to choose what is the suitable and the correct word that they want to take in their writing, speaking, listening, and reading skills.

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