结果表明，非英语专业研究生的英语写作在语篇衔接手段，主位结构与信息结构和情景语境方面都存在连贯问题。
The errors in these three aspects are the main factors that degrade the coherence in non-English major graduate students'English writings.
本文通过分析在简单句中主语与主位的重合和非重合关系，力图探索各语言要素之间的内在联系。
Analyzing the homology and nonhomology between subject and theme in simple sentences, this paper tries to explore the internal links among linguistic factors.
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