Is there an Objective-C library that does the same thing as Ruby-English Gem does?

http://english.rubyforge.org/

require 'english/inflect'

    "boy".plural      #=&g开发者_运维百科t; "boys"
    "ox".plural       #=> "oxen"

    "boys".singular   #=> "boy"
    "oxen".singular   #=> "ox"

There isn't any provided by Apple and I haven't heard of any third-party libraries that can do that in Objective-C.