According to the variation view of sociolinguistics, grammatical items change under the influence of social factors.
社会语言学变异观认为，语法项目也会受社会因素影响而变异。
Passive voice is one of the important grammatical items in English.
被动语态是一个重要的语法项目。
Therefore, in this study, the author of the thesis defines these difficult grammatical items as inert grammatical knowledge.
上述语法难点被本文作者定义为惰性语法知识。
Chinese comparative sentences involve various structures, different words and complex pragmatic conditions, which make it difficult to select and arrange the concerned grammatical items.
汉语比较句涉及的句式、词汇多，语用条件复杂，为教学的选项和排序带来困难。
Chinese comparative sentences involve various structures, different words and complex pragmatic conditions, which make it difficult to select and arrange the concerned grammatical items.
汉语比较句涉及的句式、词汇多，语用条件复杂，为教学的选项和排序带来困难。
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