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“特殊疑问词+动词不定式”结构(what to do),可以在句中充当不同的角色,甚至可以单独使用,其本身不含主语但往往又会有相应的逻辑主语,如何确定相应的逻辑主语,本文试用空语类PRO的概念对其进行研究,发现出现在不同的位置上时,其逻辑主语并不是总是固定的,分为不同的情况强制控制、非强制控制以及任意控制,这其中不仅包含语义的因素还有语用的因素。
“Special question words + verb infinitive ” structure (what to do), can play different roles in the sentence, or even can be used alone, it does not contain the subject itself but often there will be a corresponding logical subject, how to determine the corresponding , We study the concept of Pro gram PRO and find that when it appears in different positions, its logical subject is not always fixed. It is divided into different situations: mandatory control, non-mandatory control, and arbitrary control , Which includes not only semantic and pragmatic factors.