请问Is this your sister?的答语是 Yes,it is还是Yes,she is.我看到两种回答的都有,不明白到底用哪一种

This is my siste 改为否定句 六年级英语不定项选择．．．不定项选择.( )1.Are these ______ A.fish B.fishes C.fishs D.sheep ( )2.This is the way ____ the park.A.for B.to C.in D.on ( )3.This is ____ M and this is ____U A.a.a B.an.an C.a.an D.an.a ( )4.Your siste is this your skirt this is your Maybe this is your Is this your uncle? this is your aunt. is this your business Is this your schoolbag? Is this your (空格) Is this your schoolbag? this is your pencil Is this your cake. This is your explanation? Is this your-----photo This is your destiny we enjoy having you and your siste here怎么翻译 is this your handbag请问为什么不写this is your handbag?是否可以这样写呢?