It is the topic sentence.
what shape is A paragraph whose topic sentence comes in mid-paragraph
who's asking this question? who's curious? It's a contraction of 'who is', as It's is a contraction of 'it is'
example: "Whose is this?"
Subject pronouns are used as the subject of a sentence or phrase. Object pronouns are words that are used as the object of a sentence or phrase. Subject only pronouns are: I, he, she, we, they, who. Object only pronouns are: me, him, her, us, them, whom. Pronouns that can be both subject and object pronouns: you, it, what, which, whose, that.
example: "Whose is this?"
"Whose" is used in a sentence when you are asking about or indicating possession or ownership of something by someone. For example, "Whose book is this?" or "She is the one whose car was stolen."
"Who" is used as a subject pronoun to refer to a person, while "whose" is a possessive pronoun used to show ownership or association with a person. For example, "Who is coming to the party?" and "Whose book is this?"
Whose mess is that!
3 and 84.
Men whose lechery lands them in jail are often subject to equally distasteful punishment from fellow inmates.
Sarah is the student whose project won first place in the science fair.
I don't know whose question it was. Did you see whose car that was?