Are these your a set of keys?这个句子对吗,可以这样问吗,还有就是Is this her book?的回答为什么只能是No,it isn't.而不能是No,it is not.

Are these your Are these your pencils? Are these books ( )(your)? are these your parents are these your cousin Are these your trousers?Yes,these are, Here is （）?Are these yours.A.a set ofHere is （）?Are these yours.A.a set of keys B.a set of keysC.the keys D.keys填什么 ,为什么 I lost a set of keys.然后是用 Is this yours?还是Are these yours? Are these your A.parent`s B.father and mother Are these your apple?Yse,().A.those are B.these are C.they're D.they are A.Sorry.Are these your apples?B.Excuse me.Are these your apples?选择正确的句子. These pens are your.henna Are these your _____(letter) John,are these books----(your) Are these your T-shirt These are your new jeans. Are these your ___(watch)? Are these your a set of keys?这个句子对吗,可以这样问吗,还有就是Is this her book?的回答为什么只能是No,it isn't.而不能是No,it is not.