综观“should+have+过去分词”的用法,大致可有如下几种:Ⅰ.用于虚拟条件句。表示与过去事实相反。在表示结果的主句中,当主语是第一人称时,则谓语动词用“should+have+过去分词”(注意:1.如主语是第二、三人称时,则用“would+have+过去分词”;2.美国人多用 would 来代替本句式的 should,英国人目前也常用 would 来代替should)。如: Looking at the usage of “should+have+past participle”, it can be roughly as follows: I. Used in virtual conditional sentences. Expressed contrary to past facts. In the main sentence that expresses the result, when the subject is the first person, the predicate verb uses “should+have+past participle” (Note: 1. If the subject is the second, the three is said, then “would+have+” Participal ";2. Americans often use should instead of this sentence of the should, the British are also often used instead of should). Such as: