请教：英语whatever和however

Whatever great achievements China may have in the future ,it is likely that many of them will be born in the Western China .
为什么用whatever，而不用however，however不是用来修饰形容词或副词的吗？如：
However carefully I explained ,she still didn't understand.这是一句简单句还是复合句？
另外，刚刚看到whatever great achievements she has gained can't change her plain way of life.有人说这是感叹句，What great achievements!
为什么？

whatever=no matter what, however=no matter how。
如果看了上面的等式还不能理解的话，我们就继续往下看。
1.Whatever great achievements China may have in the future ,it is likely that many of them will be born in the Western China.
无论将来中国做出什么成就，大多数都可能是发生在中国西部的。
这里的whatever修饰的是achievement，说的无论是什么成就，而不是成就有伟大。
2.However carefully I explained ,she still didn't understand.
无论我多么耐心的解释他始终都听不懂。
这里的however修饰的是carefully，说的是无论多么耐心，而不是解释了什么。
这是个复合句，主句是she still didn't understand.
3.whatever great achievements she has gained can't change her plain way of life.
无论她得到什么样的成就都无法改变她简单的生活。
而What great achievements
多伟大的成就（们），没看出哪里一样。

whatever在句子中做宾语,如whatever you want,无论你想要什么 . however在句子中做状语,如 however you want it,无论如何你想要它. 前者的句子必缺少成分,you want句子不完整,缺宾语. 而后者用的句子是完整的,you want it,这句话是完整的. 所以,判断是whatever还是however,只要判断句子完整与否就好了. 我的回答你还满意吗？望采纳，谢谢!

whatever修饰名词，虽然后面有一个形容词，但主要说的还是名词，whatever可以加形容词再加名词。而however只能直接加形容词，后面不许再跟名词。

whatever是adj however是adv 副词和介词有什么不一样这个不用解释吧~ “刚刚看到whatever great achievements she has gained can't change her plain way of life.有人说这是感叹句，What great achievements!” 是谁说的····我只能说是乱说·····那句话翻译过来是：无论获得再多的成就也没有改变她朴实简单的生活，这哪里是感叹句了，改成感叹句意思都变了