That is perfectly true: I did not want anybody else's authority to write as I did.
They indefinite means people in general; as,—
At lovers' perjuries, they say, Jove laughs.—Shakespeare.
What indefinite is used in the expression "I tell you what." It means something, and was indefinite in Old English.
Now, in building of chaises, I tell you what,
There is always somewhere a weakest spot.
Exercise.—Find sentences with six indefinite pronouns.
137. Some indefinite pronouns are inflected for case, as shown in the words everybody's, anybody else's, etc.
See also "Syntax" (Sec. 426) as to the possessive case of the forms with else.
HOW TO PARSE PRONOUNS.
A reminder.