EVERYTHING:
1.一切事物；每样事物：
This shop sells everything needed for camping. 这家商店出售一切露营用具.
Tell me everything about it. 告诉我这件事情的始末.
2. （用作表语）最重要的事；Money is everything to him.金钱对他比什么都重要.
She`s beautiful,I gree,but beauty is not everything.我同意她是美丽的,但美并不是最重要的.
SOMETHING:
某事；某物：
There`s something on the floor. 地板上有一样东西.
I want something to eat. 我想吃些东西.
ANYTHING:
1.用于否定句及疑问句：
Is there anything in that box?那个盒子里有东西吗?
Has anything unusual happend? 没有什么不正常的事发生.
They haven`t anything to eat.他们没有东西可吃.
2.无论什么：
I want something to eat,anything will do.我想要些东西吃,无论什么都可以.
NOTHING：
（后接形容词、不定式等）没什么；没什么东西；无物：
There`s nothing interesting in the newspaper. 报纸上没有什么有趣的新闻.
He`s had nothing to eat.他还没有定下吃.
Nothing ever pleased her. 没有任何东西能取悦她.
There`s little or nothing wrong with him. 他没有什么不正常.
特别注意：修饰上述四词的形容词不能放置其前,必须后置.
I have something important to tell you.
There`s nothing interesting in the newspaper.
Has anything unusual happend?
This shop sells everything needed for camping.
anything和something都表示一些的意思．都可修饰可数名词或不可数名词．主要区别是anything用与疑问句和否定句．比如说：I don't have anything interesting books.
something用与肯定句,当表示提建议时,也可用与疑问句．比如说：1：I eat something vegetables. 2:Would you like something to drink?