为啥 和 为什么 和 为何 和有什么不一样？ | HiNative In summary, '为啥' is colloquial and informal, '为什么' is the most common and neutral, and '为何' is more formal and literary The choice of which term to use depends on the level of formality and the context in which you are asking "why" in Chinese
为什么 | 简体中文-英语翻译——剑桥词典 I know very little about the whys and the wherefores of the situation 我根本不知道是什么原因导致出现了这种情况。
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