The adverb 凡 "all"
If the number of people or objects in a sentence is greater than one, you can use the adverb 凡 
, which means "all, "every" or "any".
凡 is used in written language.
凡 is placed at the beginning of a sentence, usually before a noun.
, which means "all, "every" or "any".
凡 is used in written language.
凡 is placed at the beginning of a sentence, usually before a noun. Pay attention
凡 isn’t always followed by a noun. In this case, the noun is preceded by the particle 的 .
.Examples
凡称职的医生都知道这一点
Every experienced doctor knows this
fán chènzhí de yīshēng dōu zhīdao zhè yìdiǎn
凡愿协助者可拨此号码联系
Everyone who wants to help can contact this number
fán yuàn xiézhùzhě kě bō cǐ hàomǎ liánxì
凡质量不合格的产品我们都退回
All goods of improper quality will be returned
fán zhìliàng bù hégé de chǎnpǐn wǒmen dōu tuìhuí
If 凡 is followed by an action, it has the meaning "whatever".
Examples
凡做什么事，多想想再做会比较好一些
Whatever you’re doing, you should think you can do it better than anyone else
fán zuò shénme shì, duō xiǎng xiǎng zài zuò huì bǐjiào hǎo yìxiē