Is it a cat?要求变复数

Is it a cat?要求变复数 it is a cat 怎样改为复数形式? this is a cat变复数是these is.还是they is. yes,it is.变复数 This is a cat.(改为复数形式) 单数句变复数句,复数句变单数句.It is a bus____________________ it is a green dress 句子变复数 It is a yellow skirt .怎样变复数? He is a baby变复数 It is a fish变复数 Look!There are soHe is a baby变复数It is a fish变复数Look!There are some geese变单数形式They are new pencil boxes变单数We can see eight birds on the tree变单数She is a doctor变复数 It is a cat.划线部分提问 a cat 划线 It is an orange,变复数 What color is it怎样变复数? It,is,on,the,sofa.变复数 it is my foot 变复数 It is my boot .变复数 it is a cat(用a tiger改为选择疑问句）she has a nice photo.(改为复数）求救 It is a h_,not a cat. what's this?it's a cat变为复数句