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不定式是一种广泛使用的非谓语动词形式，它有意思上的主语，这个主语被称为逻辑主语，以区别于语法上的主语。正确理解其逻辑主语对我们正确运用不定式结构很有帮助。在不定式的复合结构中，逻辑主语位于ｆｏｒ（ｏｆ）后面，不定式前面。当不定式结构充当宾语、状语或表语时，其逻辑主语常常是句中的主语，作补语时，逻辑主语为宾语、主语或修饰主语的物主代词，作定语时，主动语态的不定式逻辑主语为被它修饰的名词或代词，被动语态的不定式其逻辑主语是动作的承受者，作主语时，逻辑主语或者省略，或者由ｆｏｒ引出，放在不定式前面。
Infinitive is a widely used form of non-predicate verbs that have interesting meanings. This subject is called a logical subject to distinguish it from grammatical subjects. Correct understanding of its logical subject helps us to apply the infinitive structure correctly. In infinitive composite constructs, the logical subject is after for (of), infinitive. When the infinitive structure acts as an object, adverb or idiom, its logical subject is often the subject of the sentence. As a complement, the logical subject is the subject pronoun of the subject, the subject or the modified subject, The subject of logic is the noun or pronoun modified by it. The infinitive of the passive voice is the logical subject of the action. When the subject is the subject of logic, the logical subject is either omitted, or derived from, and placed in front of the infinitive.