为什么在这一种格式中宾语后面要加be动词?

为什么在这一种格式中宾语后面要加be动词?
如：Bill is shorter than I am.为什么不能把I后面的be动词去掉?
又如：She is as slim as I am.能不能把I am改为me或者是I或者去掉?

可以去掉.
Bill is shorter than I.= Bill is shorter than me.
She is as slim as I.= She is as slim as me.
than或as后面接的其实是一个从句,叫比较状语从句.这种从句一般都是以省略句的形式出现的,如果把每个成分都补充完整,就是：
Bill is shorter than I am short.
She is as slim as I am slim.
但实际英语中没有人这样说.
Bill is shorter than me和She is as slim as me这两个句子其实是不符合正统的英语语法的,传统的英语也不这样说.但现代英语,特别是英语口语常常有人这样说.根据这种变化,语法学家们就把这两个句子中的连词than和as当作介词来看了.

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