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。
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。
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。
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