This is a key. （改为复数句） They are a set of_.They are a set of_.在横线上填答案。

This is a key.(变为复数) This is a key.(改为复数形式）（ ）（ ）（ ）（ ）. Is this her key?怎么改为复数形式? This is a key改为一般疑问句? 我父母在第一副相片上怎么说 this is a photo 改为复数句子 school ,key的复数形式 a key is on the table改为复数句 将下列单数句改为复数句 Is this your pencil?Is that your cousin?Where is your key?Is it on the chair?This is a dog. This is his ruler(改为复数句) That is my key(改为复数句) These are his brother This is a book 改为复数句 This is a pear.改为复数句 this is a book改为复数形式 This is a dress.改为复数形式 this is a tree 改为复数句 Is this a bus （改为复数句 This is a bus.改为复数. this is a shirt改为复数句 this is a strawberry改为复数 This is a young tree.(改为复数)