This is a dog改成否定句
问题描述：
This is a dog改成否定句
改成疑问句呢，并作肯定否定回答
还有It is a box并作肯定否定回答
答
This is a dog改成否定句This is not a dog或者This isn't a dog 否定句：This isn't a dog.疑问句：Is this a dog?Yes,it is.\No,it isn'.否定句：It isn't a box.疑问句：Is it a box?Yes,it is.\No,it isn't....