Question

That is my uncle car in this setence that is a pronoun or adjective

Answer 1

Here is the answer:

In the sentence: That is my uncle car.

That is the Demonstrative Adjective.  

Explanation:

Demonstrative Adjectives are adjectives that are used to modify a noun so that we know which specific person, place, or thing is mentioned.

A demonstrative adjective, like that, helps indicate a noun or pronoun in a sentence.

Answer 2

Explanation:

my uncle has just brought anew car .that car is my uncle change into pronoun.