Question

which is indefinite pronoun in someone is there on the roof​

Answer 1

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Indefinite pronouns that end in -one are always singular. These words include anyone, everyone, someone, and one. Indefinite pronouns that end in -body are always singular. These words include anybody, somebody, nobody.

Answer 2

$\huge\mathfrak\purple{Question:}$

Which is indefinite pronoun in someone is there on the roof.

$\huge\mathfrak\blue{Answer:}$

Someone✔️

=> Someone is the indefinite pronoun in someone is there on the roof.

$\mathfrak\red{More \: to \: know:}$

Indefinite pronoun doesn't sure about anything.

In this given sentence someone refers that the speaker is not sure that actually who is there on the roof.

$\mathfrak\orange{hope \: it \: helps...}$