“that's”的复数形式是什吗?

“that's”的复数形式是什吗? What's that的复数形式 that的复数形式 that’s an orange变复数形式 That's a girl.改为复数形式 That's a box变成复数形式 That's Chinese bike.变成复数形式 that的复数形式是什么 that this 的复数形式 it's的复数形式 That is his brother的复数形式 this和that的复数形式 Is that his uncle的复数形式 Is that a photo?的复数形式 it,that,friend的复数形式. is that her counsin 的复数形式 That's my sister(改为复数形式） That's an English book.(改为复数形式)