若不定式的动作发生在谓语动作之前或强调动作已经发生,不定式用完成式。 I am sorry to have cheated you.很抱歉欺骗了你。 当不定式的逻辑主语与不定式是被动关系时,不定式一般用被动式。 The novel is said to have been translated into several languages.据说这部小说已被译成了好几种语言。
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