。what 与whatever 引导宾语从句的区别？举例说明。

这两个句子what 和whatever可以互换不？I'll do what I can.

we'll do whatever we can to save him

我觉得这两个句子what 和whatever可以互换。I'll do what I can. We'll do whatever we can to save him
因为what 做代词，意为“…的事物”，“(用以询问某人或某事物的词)什么、多少”，可用来引导名词性从句，并在从句中做主语或宾语；whatever用作代词，意为“任何(事物)”、“每样(事物) 无论什么”、“不管什么”，可引导名词性从句或状语从句；no matter what意为“无论如何”、“不管怎样”。
又如：
1.I didn’t get what you said just now.
2.It is unwise to give a child whatever he wants.
3.I will do whatever you wish.我会对你言听计从。
4.He gave me what/ whatever I wanted for my study.
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no matter what =whatever 但是，no matter what 引导的从句是副词性从句，用作状语。 而 whatever 引导的从句是名词性从句，只能用作宾语从句或主语从句。