“情态动词+have+过去分词”这一结构是情态动词的一个重要用法,掌握一些这类结构常见的形式是很有必要的。一、must+have+过去分词该结构用来表示说话人对已经发生过的事情或存在的状态进行的一种合乎情理的逻辑推断,或确有把握的推测,一般只用于肯定句中,可译作“准是已经 The structure of “modal verb+have+past participle” is an important use of modal verbs. It is necessary to grasp some common forms of such structures. First, must+have+ past participle The structure is used to represent a reasonable logical inference, or a sure assumption, of a speaker’s occurrence or state of existence, which is generally used only in affirmative sentences. Translation is "has already been