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ck, nails and blueprint", but large prefabricated language blocks(prefabs). Pawley & Syder (1983) also pointed out, native speakers have tens of thousands of“words stem "(lexicalized sentence stems). Sinclair points out (1991:33) that "grammargenerating infinite combinatorial possibilities, but in practical use, these combinations areoften ignored, only those particular word combinations appear repeatedly". Skehan (1998:40)stressed that "in the rapid communication, we most of the time are dependent on Languagechunks in memory". These ideas are illustrated by appearance of lexical chunks in our speech.In recent years, studies in linguistics are becoming increasingly aware of the lexical chunks inacquisition and use of language. Different scholars use different terminology when they referto lexical chunks. In early 1970s, Becker (1975) and Bolinger (1976) called this languagephenomenon "prefabricated chunks" (prefabricated chunks), Pawley & Syder (1983) used“lexicalized sentence stems”, and Nattinger & DeCarrico (1992) called them “lexicalphrases” (lexical, phrases), whereas Lewis (1997) called them “lexical items” and Wray(2000) used “stylized words” (formulaic sequences). The use of so many terms showssignificance of the study on language chunks and the diversity and complexity of thisphenomenon.

3. Research Design and Methodology........... 27-33
    3.1 Research questions......... 27
    3.2 Participants .........27-28
    3.3 Instruments......... 28-29
        3.3.1 The writing experiment......... 28
        3.3.2 Questionnaire .........28-29
    3.4 Procedures......... 29-31
    3.5 Data collection......... 31-33
4. Results and Discussion.........33-48
    4.1 Results and analysis on the writing.........33-38
    4.2 Results and analysis on questionnaire......... 38-48
5. Conclusion......... 48-55
    5.1 Major findings of the present study .........48-50
    5.2 Implications......... 50-52
        5.2.1 Theoretical implications......... 50
        5.2.2 Practical implications......... 50-52
5.3 Limitations of the present study and suggestions......... 52-55

Conclusion

As impacted by objective factors and ability of the author, this study has many insufficiencies.The experiment was performed in the vocational high school that the author works, and its resultsmay not reflect overall circumstance of the vocational high schools. As school is different, thestudents’ learning levels, learning objectives, learner autonomy, and their interests and methodswill all be different, and the effect of training will likely be different too.The size of the sample is so small that it cannot generalize the rules for all the students. Dueto limitation of time and energy, the author has only tried two classes for this experiment.Secondly, the limited times of instruction may not produce enough change in students’ oralEnglish skills. Lexical chunks may be a totally new concept for the participants. They need moretime to accept it, and apply it i本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。