The traditional rule is that personal pronouns after the verb to be take the nominative case (I; she; he; we; they). Some 400 years ago, me and other objective pronouns (him; her; us; them) began to replace the subjective forms after be. Today, such constructions - It's me. That's him. It must be them -are almost universal in informal speech. In formal speech and in edited writing, however, the subjective forms are used: It must be they. The figure at the window had been she, not her husband. The objective forms have also replaced the subjective forms in speech in such constructions as Me neither. Who, them?
传统规则是,动词be后的人称代词应采用主格形式(I;she;he;we;they)。大约400年前,me和其它宾格代词(him,her,us,them)开始取代be之后的主格形式。如今,It's me. That's him. It must be them.这样的结构在非正式口语中几乎是普遍存在的。但在正式演讲和编辑写作中仍使用主格形式:It must be they. The figure at the window had been she, not her husband. 在口语Me neither. Who, them?这样的结构中,宾格形式也取代了主格形式。
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