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r voca bulary acquisition. Hopefully, this study can contribute to both theoretical and practical work.
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Chapter 2Literature Review

2.1 Vocabulary Learning
Vocabulary is very necessary for English learning. Learners can learn or acquire vocabulary in dif ferent ways. Acquiring vocabulary incidentally is a good and efficient way for learners. In this part, the definition of vo cabulary learning and incidental vocabulary acquisition will be clarified.Vocabulary means all the words that a pe rson knows or uses, or all the words in a particular language. It also re fers to the words that people use when they are talking about a particular subject. Besides, it has the meaning of a list of words with their meanings, especially in a book for learni ng a foreign language. All of the above meanings of “vocabulary” are from “Oxford Advance Learner’s Dictionary” (2015, 9th Edition). Learning refers to gaining skills or kn owledge, often by studying or being taught by someone. The term “vocabulary” is used in different places.It is not only used to represent the total number of words in a language, but also can represent all the specific historical period of the word, such as old English vocabulary, middle English and modern English vocabulary . People also use it to repr esent all specific dialect vocabulary, the words of a book, a kind of academic vocabulary and a person’ s vocabulary.
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2.2 Theor etical Framework Associated with Incidental Vocabulary Learning
In this part, som e related theories would be introduced such as Input Hypothesis , Noticing Hypothesis, Involvement Load Hypothesis and Depth of Processing Model. These theories can explain the law of inci dental vocabulary acquisition from different perspectives. And with the help with these theories, the experiment in this thesis can be carried on successfully. Krashen’s input hypothesis has contri buted a lot to incidental vocabulary acquisition and his research also gave instructions for scholars and other linguists. American linguist Krashen (1989) put forw ard the famous and controversial second language acquisition mode--“supervisory m ode” in the early 1980s.It included five hypotheses--the Acquisition and Learning Hypothesis, Natural Order Hypothesis, the Monitor Hypothesis, Input Hypothesis a nd Affective Filter Hypothesis.Krashen (1989)summarized these five hypotheses, a nd did som e detailed description and demonstration, especially affirmed the important status of the input hypothesis.Input hypothesis, he thought, “m aybe is the sec ond language acquisition theory, the only one of the most important concepts”, because it answered one of the key questions in language learning, namely how to acquire language, especially a foreign language.He thoughtit’s not enough to sim ply argue the language input, for the learners need “comprehensible input”. “Com prehensible input” is a necessary condition fo r language acquisition.
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Chapter 3 Methodo