whenever.however.wherever.是什么意思.?用法及例句.

whenever 不论何时
e.g.I told him to come back whenever he wants to.
我告诉他什么时候想回来就回来.
however
连接词 conj.
1.然而,可是,不过
I feel a bit tired.However,I can hold on.
我有点累了,但我能坚持下去.
副词 ad.
1.无论如何,不管怎样
However hot it is,he will not take off his coat.
无论多热,他也不会脱掉外衣.
2.不管用什么方法
However he tries,he never seems able to work satisfactorily.
不管他怎么努力,他好像总不能令人满意地工作.
3.究竟怎样,到底如何
However did you know that?
你到底怎么知道那件事的?
wherever
连接词 conj.
1.无论在哪里;无论到哪里
We'll go wherever you like.
你爱去哪儿我们就去哪儿.
2.无论什么情况下
Wherever it is possible,he tries to help.
只要有可能,他总是设法帮忙.
副词 ad.
1.无论什么地方;去任何地方
I'd like to go to Paris,Milan,or wherever.
我想去巴黎、米兰,或是别的什么地方.
2.【口】究竟在哪里;究竟到哪里
Wherever did you get the book?
你到底在什么地方弄到这本书的?