复数形式：knives。
以f或fe 结尾的名词变复数时，有两种方法：：
1、加s，例如：belief-beliefs、roof-roofs、safe-safes、gulf-gulfs 。
2、去f，fe加ves，例如：half-halves、knife-knives、leaf-leaves、wolf-wolves、wife-wives、life-lives、thief-thieves。
例句：
1、I have three knives.
“我有3把小刀。”
2、There were forks, knives, spoons, and chopsticks.
“他们是叉子，刀子，勺子和筷子。”
3、I'm pricked and probed by what feels like knives, not needles.
“我觉得这些针剂更像是刀子，它们在刺我、在戳我。”
4、The stories I could tell you. Time and time again, how your knives have pulled my ass out of the fire.
“我可以跟你讲很多这样故事，关于你们生产的刀是怎样一次又一次的救我于水火之中。”
米拉妹妹12
