This is sb's sth中对sb's提问

This is sb's sth中对sb's提问
This is sb's sth中对sb's提问

This is sb's sth中对sb's提问
Whose + sth is this?这是谁的...

whose sth is this?
比如：this is tom's book. 问句 whose book is this?

Who does sth belong to?
Who is sth's owner