Chinese grammar: Expressing all with 什么都shenme dou

"什么...都/也" (shénme...dōu/yě) is a pattern often used to express "all" or "everything". This pattern also works with other question words, such as 哪儿　and 什么时候 in Chinese grammar.

Structures

The structure is very clear, as many Chinese grammar points are.

什么+noun.+都
什么+noun.+也
什么+都/也

Examples 

Wǒ shén me dōu zhī dào.
我 什么 都 知道。

I knew everything.

Negative Structures 
The negative structure simply adds a 不 or a 没 after the 都/也.

什么+noun.+都/也+不
什么+noun.+都/也+没

Examples 

Jīn tiān wǒ shén me dōnɡ xi dōu méi chī.
今天 我 什么 东西 都 没 吃。

Today I didn't eat anything.