Is this his watch?Yes,it's.这一句话哪儿错了!并改正!
问题描述：
Is this his watch?Yes,it's.
这一句话哪儿错了!并改正!
答
在一般疑问句的回答中不用缩写形式
所以你的句子应该改为：
Is this his watch?Yes,it is.