This article deals with the expansion of who, which is replacing its original objective whom in not a few constructions. The result is the mismatch between the morphological case form and the grammatical function. The original objective whom is now on th moribund. It is argued here that the objective who constructions, where whom is expected according to the grammatical function, are produced by two 'who' rules: The Basic 'who' Rule and the Extended 'who' Rule. These two rules are examples of grammatical virus rules, proposed by Sobin(1994, 1997) and Lasnik & Sobin(2000). A virus rule is a language-particular rule producing the usage(s) not predicted by grammatical viruses, however, we will revise the notion of grammatical viruses. Our revision is that a grammatical virus rule produces a socially inferior usage and so a virus-infected inferior usage should be cured by the UG system later in an effort for a speaker to get social prestige within a speech community. This revision is opposite to the original notion of grammatical viruses that they produce socially prestigious usages. At the same time, our 'who' rules are also the reverse versions of Lasnik & Sobin's(2000) 'whom' rules, Our revision of the rules is necessary to account for the ungrammaticality of such constructions as To who did you speak? or the person to who you spoke, which is not explained in terms of Lasnik & Sobin's(2000) 'whom' rules.
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