adverb, noun · how; what; used to express a high degree in exclamatory sentences

这里的景色多么美丽啊！

adverb · however; no matter how; used to indicate that a condition holds regardless of the degree

无论多么困难，我们都不能放弃。

adverb · how; to what extent; used in interrogative sentences to ask about degree or magnitude

你难道不知道这件事对他有多么重要吗？