anyone意為任何一個人,多用于否定句或疑問句,也可用于某些肯定句
Is anyone here?有人嗎?Anyone can do it.隨便誰都會.
something 有些/某人/某事,一般用于肯定句中
例：There is something wrong with you.(固定詞組)
anything 意思是：1）有些,相對于something,用于疑問句中；2）任何事
用法：1.(用于疑問句或if從句時)什么東西,什么事情
Do you have anything to say?
2.(用于否定句時)任何東西,任何事情
Don't be dependent on anyone for anything.
3.(用于肯定句時)無論什么東西,無論什么事情
My dog will eat almost anything.
everything 意思是：每一件事
用法：Everything is ready.（萬事俱備）
She does everything to help her mother.她盡全力幫助她母親.