不定式是非谓语动词的重要情形之一。由于它具有名词、动词、形容词和副词的多种特征,所以在句中可以作主语、宾语、表语、状语、宾语补足语、主语补足语、同位语或独立成分。不定式作定语时兼有主动式和被动式两种形式,现归纳如下:一、不定式作定语只能用主动式的情形(一)不定式所修饰的名词和不定式中的动词所表示的动作是逻辑上的主谓关系(此 Infinitives are one of the important cases of non-predicate verbs. As it has many characteristics of nouns, verbs, adjectives and adverbs, it can be used as the subject, object, table language, adverbial, object complement, subject complement, appositive or independent elements in the sentence. Infinitive attributive both active and passive forms, are summarized as follows: First, the infinitive as the attributive can only be used in the active case (a) infinitives modified nouns and infinitive verb expression Action is the logical relationship between the subject and the subject (this