Chapter One Introduction
1.1 Research background
其复杂的，多方面的性质似乎不断地逃避充分的说明和解释，并写作的著作如何，英语毕业论文，应该如何正确教导已经引起了很多的查询方式。写作起着重要的影响，在我们的个人经验和社会认同，大多数大学生英语写作是最难掌握的，他们感到很无奈，而他们的英语写作测试。因此，项目发展学生的写作能力是一个非常重要的组成部分，英语论文，在大学英语教学。句子如何，他们写的部分可以展示自己的写作质量。许多探讨人员（海耶斯&Flowers; Khaldieh2017年，宇泽及1989年孜然，Krapels1990）要重视写作过程的模型探讨，写作策略和学习策略和英语写作过程之间的联系，但很少有探讨关注他们的探讨ESL写作的句法特点。
Its complex, multifacetednature seems continuously to evade sufficient description and explanation and howwriting works and how it should be properly taught have aroused many forms ofinquiry. Writing plays an important role in our personal experience and socialidentities, and for most college students English writing is most difficult to master andthey feel helpless while they take an English writing test. Therefore, the developmentof students' writing competence is a very important part in college English teaching.How sentences they write in part can show their writing quality. Many researchers(Hayes&Flowers; Khaldieh 2017, Uzawa & Cummin 1989，Krapels 1990) pay theirattention to the study of the model of writing process, the writing strategies and therelationship between learning strategies and ESL writing processes, but fewresearches focus their studies on syntactic features of ESL writing．
1.2 Significance of the study
It is well known that a sentence plays an important role in an article. Features ofsentence may influence the whole quality of the article and reflect learner's writingcompetence. This research studies the syntactic features in terms of syntacticcomplexity, syntactic variety and cohesions.The number of clause complex is regarded as the standard of syntacticcomplexity, and the structure of clause and subordinate clause reveal the students’writing ability to deal with different sentence structures. A student with advancedwriting competence will apply difficult sentence structures, which can illustrate moreintricate meanings．Sentence variety is also of great importance in ESL writing. An advanced studenthas the ability to use a variety of sentences to express their thoughts while lowerability students tend to use a few basic sentence structures time and time again, whichmakes the readers feel bored and lose interest in their writings. Therefore, varyinglengths and forms of sentence structures are necessary in the process of Englishwriting．Syntactic cohesion, which is based on cohesion, coherence, and rhetoricalorganization relates to textual competence. It includes the knowledge of theconvention for joining utterances together to form a text. Cohesion comprises ways ofexplicitly marking semantic relationships such as reference，substitution，ellipsis，conjunction，and lexical cohesion as well as conventions such as those governing theordering of old and new information in discourse. Since cohesion is a broadconception this thesis considers one aspect: conjunctive adjuncts. How students useconjunctive adjuncts in their writings may reflect their ability to organize linguisticsignals in communication and the ability to use these signals to refer to persons,objects, ideas, and feelings. Hence, the appropriate use of syntactic cohesions reflectsstudents' writing competence.
In China, studies of syntax seem to be confined from one perspective or another.For example, some look into syntactic fluency in writing products (Fen, 2017), othersdiscuss the syntactic features in terms of complexity (Tang, 200
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