の is used as the nominative auxiliary word.

Continuation: body language (nouns, numerals and pronouns)+の+body language (nouns, numerals and pronouns)

Usage: indicates the relationship between two items, which means "de" in Chinese. The "body language+の" in front of this usage is used as an attribute to modify the body language behind it.

Example:

わたしはのです Japanese teacher. /I am a Japanese teacher.

Here, "Japanese" is a kind of body language, which together with the nominative auxiliary word "の" constitutes an attribute to modify the body language "teacher" behind it.

The extended data "の" is used as a quasi-nominative auxiliary word.

Usage: Used as the nominative auxiliary word "が" to indicate the subject of a clause in the attributive, rather than a simplified modifier noun of the clause.

Example:

Live in a private house. /This is my room.

Live in a private house. /This is my room.

The "private house" and "private house" here are definite sentences, which are used to modify "house". In a definite sentence, "private" is the subject of "living". At this time, the suggestive subject can use the nominative auxiliary word "が" or the quasi-nominative auxiliary word "の". "They can be used interchangeably.