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首先请看一道试题: Isn’t__rude__him to talk to his teacher like that? A．that;for B．he;of C．it;for D.it;of 该题考查不定式的复合结构,答案为D。当不定式需带上自己的逻辑主语时,须用介词for／of引出其逻辑主语sb．,即for／of+sb．+to do sth．(不定式的复合结构)。具体表现在句型“It is+adj．+for／of+sb．+to do sth．”中。透过下图,你会明白何时该用介词for或of引出sb．。
First, look at a test question: Isn’t__rude__him to talk to his teacher like that? That;for B. He;of C. It;for D.it;of This question examines the complex structure of the infinitive, the answer is D. When infinitives need to bring their own logical subject, they must use the preposition for/of to elicit their logical subject sb. , namely for/of+sb. +to do sth. (Infinitive composite structure). It is embodied in the sentence pattern “It is+adj.+for/of+sb.+to do sth.” Through the figure below, you will understand when to use the preposition or for sb. .