【正确答案】：
IT IS NOT UNUSUAL TO HAVE NOUNS CONVERTED FROM ADJECTIVES. UNLIKE VERBS, NOT ALL ADJECTIVES WHICH ARE CONVERTED CAN ACHIEVE A FULL NOUN STATUS. SOME ARE COMPLETELY CONVERTED, THUS KNOWN AS FULL CONVERSION, OTHERS ARE ONLY PARTIALLY CONVERTED, HENCE PARTIAL CONVERSION. A NOUN FULLY CONVERTED FROM AN ADJECTIVE HAS ALL THE CHARACTERISTICS OF NOUNS AND CAN TAKE AN INDEFINITE ARTICLE OR –(E)S TO INDICATE SINGULAR OR PLURAL NUMBERS, SUCH AS WHITE VALUABLE. BUT NOUNS PARTIALLY CONVERTED FROM ADJECTIVES DO NOT POSSESS ALL THE QUALITIES A NOUN HAS. THEY MUST BE USED TOGETHER WITH DEFINITE ARTICLE. THEY RETAIN SOME OF THE ADJECTIVE FEATURES, FOR EXAMPLE, THE POOR, THE RICH.
【题目解析】：名词从形容词转换出来并不罕见。不同于动词，不是所有被转换的形容词都能达到完全名词状态。有些是完全转换的，因此称为完全转换，而另一些只是部分转换，因此是部分转换。完全从形容词转换而来的名词具有名词的所有特征，可以采用不定冠词或–s来表示单数或复数，如白色值。但是名词部分地从形容词转换而得不到名词的所有品质。它们必须与定冠词一起使用。他们保留了一些形容词的特征，例如，穷人，富人。