如何区别whoever whomever例：we usually have to take our gloves off

如何区别whoever whomever例：we usually have to take our gloves off To show our respect,we usually have to take our gloves off _ 英语 whoever whomever 区别 whomever与whoever的区别 whoever 和whomever的区别 whoever与whomever的区别 whomever ,whoever whoever与whosever与whomever区别 who whom whomever whoever有什么区别 send to ----------,是whomever 还是whoever? 麻烦回答一些英语问题1.we wrote to __invited us.为什么用whoever而不是whomever? we wrote a letter to ____ had helped us.A whoever B whomever