A question about the word "positive"
Anything you do is a positive.The word positive is a adjective,How can it used as a noun in this sentence?

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"Anything you do is a positive (thing)." That's how you read it. :)

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positive has many meanings.  Check the dictionary. For example "his cancer results came back positive."

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英语单词的词性变化比较大，很多次既可以是名词，也可以是动词或形容词，这里的positive就是个例子，它既可以是名词，同时也是个名词..:)

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It just is! We can use it as and adjective or a noun.