The doubling of nouns
The doubling of nouns expresses the plural form of a noun and means “everybody”, “each”.
The doubling of one-syllable nouns
One-syllable nouns are nouns that have one character.
They are doubled according to the AA structure. So you need to state a noun twice.
For example:
人人 
年年
事事
年年
事事 Examples
人人都喜欢
Everybody likes it
rénrén dōu xĭhuan
事事顺利
Everything is going well
shìshì shùnlì
The doubling of two-syllable nouns
Two syllable nouns are nouns that have two characters. They are doubled according to the AABB structure. Each character is stated twice.
The following examples show how to use the double nouns 山水 and 年岁 .
and 年岁 .Examples
你看这儿的山山水水
Look at the local mountains and rivers
nĭ kàn zhèr de shānshān shuĭshuĭ
祝你年年岁岁平平安安
I wish you peace and prosperity each year
zhù nǐ niánnián suìsuì píngpíng ān'ān