business

1.business原来是busy＋ness，是相当于busy的抽象名词，但现在有busyness是相当于busy的抽象名词。

2.in business是“在经营商业”，是形容词短语或状语短语。on business是“因事或因公（不是玩耍）”，是状语短语。如He is in business, He is engaged in business和He wants to see you on business。比较下面两句：

He is in business there.

He is there on business.

3.go to business是“到办事处去”，go into business是“开始经商”，如He goes to business by bus和He went into business at twenty。

4.Mind your own business的意思是“别管他人的闲事”，就是“（我）不用你干涉”，不是“别让他人管你的事”。