Question

Which pronoun changes its form least as its case changes? you I they she

Answer 1

You, as there are only two forms: you and your(s)

Answer 2

Answer: the pronoun that change least as its case changes is you.

Explanation: the pronouns mentioned are described below:

Subject Pronouns                                         Object Pronouns

I = first person, singular                                           me

They= third person, plural                                       them

you= second person, singular or plural                 you

She= third person, singular                                     her

As you can see you is the subject pronoun in singular and in plural and it's also the object pronoun.