something, anything, nothing, everything 是指物的不定代词。
somebody, someone, anybody, anyone, nobody, everybody, everyone 是指人的不定代词。
somewhere, anywhere, nowhere, everywhere 是指地点的不定代词。
当形容词修饰不定代词、 不定副词时, 放于其后; something special; somewhere wonderful.
不定代词、 不定副词做主语时, 谓语动词用第三人称单数。 如: Is everybody here? 大家都到齐了吗?
something, somebody, someone, somewhere 用于肯定句及表示请求或建议的疑问句中
anything, anybody, anyone, anywhere 用于否定句、 疑问句及,条件状语从句
Did you do anything interesting? 你做了有趣的事吗? (表疑问)
Why don‘t you visit someone with me? 你为什么不跟我一起去拜访下某个人呢? (表建议)
If anything happens, please tell me. 如果有事情发生, 请告诉我。