Put the pronoun in brackets into the correct form: I/me/my/mine/myself. For example, (I) Mr Wilkins is _____ boss. → Mr Wilkins is my boss.
(I) Why didn't you call ?
Let's sum up all personal and possessive pronouns in one table.
His and its have the same form in the third and fourth columns — as a possessive adjective and as a possessive pronoun.