这句英语谚语为什么无谓语动词?An eye for an eye and a tooth for a tooth.

题目

这句英语谚语为什么无谓语动词?An eye for an eye and a tooth for a tooth.
这样直接写在作文中对吗？

答案

An eye for an eye 要用在句子里,有时要加一个动词：give
I decided to give him an eye for an eye.我决定对他以牙还牙.
单独用时可以这样：
You know what they say,an eye for an eye.俗话说,以牙换牙.