Question

What is the plural possessive form of Chinese?

Answer 1

"Chinese" cannot be plural or possessive.

Explanation:

"Chinese" is an adjective. It describes nouns.

You can say, "I like Chinese food."

You cannot say, "Chinese went to the store."
It doesn't stand on its own. Adjectives must describe another word.

If you say, "A Chinese person went to the store," that would make sense.

Then you can make your phrase plural and possessive by saying, "Chinese people's cookies taste wonderful."

Answer 2

Additional information:
The word "Chinese" is a proper adjective and a proper, uncountable noun.

Explanation:

The proper (mass) noun "Chinese" is a word for the languages of China and a word for the people of China as a group.
The mass noun can have a possessive form: Chinese's
Example: I have tried to understand the Chinese's social system.