初一英语的复数形式,请简单说明,

题目

初一英语的复数形式,请简单说明,
1.This is my uncle.
2.Is that his friend?
3.Is she your sister?
4.this is a photo.

答案

是想把这些句子变为复数形式么?
1 They are my uncles
2 Are those his friends?
3 Are they your sisters?
4 They are photos