关于比较级的句子问题

因为is后面省略了 形容词啊

比如

I am better than she is.

这里应该是

she is good , (but) I am better

明白了吧～

than可以作介词，例如：She is taller than me.
也可以作连词，例如：She is taller than I am.

因为有些词语有自己的比较级,最高级,比如high higher highest

原句I am better than she is good.
可省略成she is或she或her