1.

the carnival was spring (wrong)

the carnival was spring one (right)

the cookies were Chirstmas (wrong)

the cookies was Chistmas ones (right)

why the first sentence is wrong ,and the the secong is right ? waiting for your explanation .thank you

2."one's" is used only if the subject "one" is present,following with his will not be acceptable.so why ??

examplene can only do one's best (right)

               one can only do his best (wrong)

形容词分表语形容词(用来描述主语特征)和定语形容词

在你举的两个例句中 spring和Christmas都不能作为表语形容词 所以加上one或者ones

知道形容词分表语形容词（如AWAKE ，AFRAID等）和定语形容词（如GOOD），但是这个和我

举例的有什么关系么？spring 和christmas 都是名词呀，

能否细说一下，小弟才疏学浅。

the carnival was spring (wrong)

the carnival was a spring one (right)

the cookies were Chirstmas (wrong)

the cookies were Chistmas ones (right)

是我说错了

carnival不可能是spring cookie也不可能是Chistmas 这个狂欢节是一个春天的狂欢节 这些饼干是圣诞节饼干 这样才合乎逻辑

spring和christmas分别做定语修饰后面的one

是的 不过我觉得你的例句一有误

是不是应该这样  the carnival was a spring one