many parents fear that websites like myspace and faceback are a threat,a door open to.上面的句子中are 的后面为什么是单数a threat,比如当你看到一群鸭子的时候,应该不会说“它们是一只鸭子”吧

来源：学生作业帮助网编辑：六六作业网时间：2024/11/28 17:23:08

manyparentsfearthatwebsiteslikemyspaceandfacebackareathreat,adooropento.上面的句子中are的后面为什么是单数athreat,比如

many parents fear that websites like myspace and faceback are a threat,a door open to.上面的句子中are 的后面为什么是单数a threat,比如当你看到一群鸭子的时候,应该不会说“它们是一只鸭子”吧
many parents fear that websites like myspace and faceback are a threat,a door open to.
上面的句子中are 的后面为什么是单数a threat,比如当你看到一群鸭子的时候,应该不会说“它们是一只鸭子”吧

many parents fear that websites like myspace and faceback are a threat,a door open to.上面的句子中are 的后面为什么是单数a threat,比如当你看到一群鸭子的时候,应该不会说“它们是一只鸭子”吧
解题之前要有个大方向就是英语是个喜欢讲逻辑关系的语言并且要把逻辑关系体现在字里行间,比如有单复数时态变化主谓要一致,这点不像汉语.
myspace and faceback 只是威胁的例子罢了.are 之前虽然是一个以上的事物（myspace and faceback ）但are 后面的threat是对举例的一个概念性的总结,变成概念性的东西了.后面的door也是如此.举再多例还是a threat,你所说的鸭子也可以这么说,比如你怕鸭子,一个鸭子对你来说是威胁,一百个鸭子对你来说也是一种威胁,“威胁”和“鸭子”本不是一个概念,一个是实物一个是抽象概念,不适用用主谓一致原则,理解吗

一种威胁

用are是因为主语是复数，而表语也是由几个单数构成的复数概念a theatre, a door open to ... and ....，应该用are.

不能这么死板，BE动词语法上要和主语对应，而且有时复数的词在语意上是作为整体出现的，家长认为网站是威胁，显然网站只是威胁的一种，后面的标语更主要起表达意思的作用
比如：THERE ARE A LOT OF PEOPLE 分析的话，标语其实是LOT，PEOPLE是说明性的，但这里用A LOT，因为LOT的意思就是一大堆了，用很多堆就很别扭了。
英语也要从逻辑上考虑，这是其重要特点...

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