His telephone color is white.和Her telephone color is yellow.这两句话有错误码?

问题描述:

His telephone color is white.和Her telephone color is yellow.这两句话有错误码?
我的老师说这两句话telephone的后面要加上's加不加啊?急

加因为是电话的颜色吗!'s表是"的"的意思 加了'S才能将lelephone 和 color 连起来