空语类（empty category）是指具有某些句法和语义功能，但没有实际语音表现的语言成分。空语类在乔姆斯基转换生成语法中一直占据着重要地位。
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The results reveal that the overt pronouns and the null anaphors were dealt with equally. Experiment 2 also confirms the findings in two other studies with children acquiring English that children may interpret all empty categories as pronouns.
这项试验与前人所做的两项同类试验结果吻合，由此可以得出结论:儿童可能把所有的空语类理解为代词。
参考来源 - 中国儿童对C原则的习得空语类是指存在于人类语言的深层结构中但在表层结构没有语音表现的一类名词性词语或短语。
参考来源 - Empty category refers to a certain type of noun phrases which exists in the deep structure of human language but does not have any phonetic realization in the surface structure.·2,447,543篇论文数据，部分数据来源于NoteExpress
空语类理论在管辖与约束理论中占有十分重要的位置。
The theory of Empty Category is one of the most important parts in Government-and Binding Theory.
英、汉语空语类在指称特征上存在着共性，但也呈现出不同的个性特征。
There exists a kind of similarity as well as differences between the referential features of empty categories in English and Chinese.
在词序方面，汉语中使用无主句可表达委婉语气，英语中不能省略主语，但能用空语类或使用被动态表达委婉语气；
On word order:Subject-less sentences can be used in Chinese to show the meaning of euphemism while English tends to use passive voice or expletive words.
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