Possessive ( Whose + Noun + is ( this –that ) Or are ( these – those )

Possessive Adjectives : my – his – her – its – our – their – your

Possessive Nouns : mine – his – hers – ours – theirs – yours

1- The dress is hers ---- Whose dress is this ?
2- The jacket is his ---- Whose jacket is that ?
3- The books are theirs ---- Whose books are these ?