fork and knife可以变复数吗

fork and knife可以变复数吗 例如说horse and cart,knife and fork这类词组怎么变复数呢? Knife-and-fork a knife and fork 后面接单数还是复数 a knife and a fork 动词用单数还是复数 knife and fork 类似词组? my knife is on the table and near the fork之间的and 可以直接去掉吗 two sets of fork and knife（后面两个单词是否用复数） there is a knife and fork missing 这里是不是应该是fork and knife呢? knife and fork的引申义是什么? “knife”怎样变复数形式?