pron. 任何人, 无论谁

• what/whatever;that/what; who/whoever的用法
  
  1）what = the thing which；whatever = anything
  What you want has been sent here.
  Whatever you want makes no difference to me.
  2) who= the person that　 whoever= anyone who
  （错）Who breaks the law will be punished.
  （错）Whoever robbed the bank is not clear.
  （对）Whoever breaks the law will be punished.
  （对）Who robbed the bank is not clear.
  3) that 和 what　
  当that引导定语从句时 ，通常用作关系代词，而引导名词性从句时，是个不充当任何成分的连接词。宾语从句和表语从句中的that常可省略。What只能引导名词性从　句， 用作连接代词，作从句的具体成分，且不能省略。
  I think (that)

however/whatever/wherever/whoever/whomever/whichever
记忆：
1. however [ hau5evE ] adv. 无论如何, 可是 conj. 无论如何 However you love her, you mustn’t disturb her. 无论你多么爱她，你都不许打扰她。
2. whatever [ wCt5evE, hw-] pron. 凡是...,无论什么 conj. 无论什么 It will spoil your child if you give him/her whatever he/she wants. 孩子要什么你就给什么，这会毁了他/她。
3. wherever [ (h)wZEr5evE ] adv. 无论那里, 无论什么情况下 There will be laughter wherever he goes. 他走到哪儿，哪儿就有笑声。
4. whoever [hu:5evE(r)] pron. 任何人, 无论谁 The award will be given to whoever gets the first at the contest.在比赛中获第一的人将受到奖励。
5. whomever pron. 任何人, 无论谁 I don’t care whomever she likes. 我不在乎她喜欢谁。
6. whichever [ (h)witF5evE] pron.无论那一个, 任何一个 Whichever you choose, the book or the camera, I will pay for it.书与相机中无论你要哪一个，我都会买单的。
另类阅读：
Wherever we go and whenever it is, we should remember to do whatever is necessary. However wise you are, you should show respect for whoever comes to you.