苗语声调越发达 ,前缀构词功能越弱 ;声调越不发达 ,前缀构词功能越强。前缀有限制名词语义的功能。数词、量词、动词、形容词加前缀可以名词化。句子中名词语义不明确时 ,前缀对其作出限制 ,名词语义在有参照对比而使语义明确化时 ,前缀可有可无。 The more developed the tone of the Miao language, the weaker the prefix word-forming function. The less developed the tone, the stronger the prefix word-formation function. The prefix has the function of limiting the semantic meaning of the noun. Numerals, quantifiers, verbs, adjectives plus prefix can be nominal. When a noun’s semantics in a sentence are ambiguous, the prefix restricts it, and when the semantic meaning of a noun’s semantics is clarified with reference to contrast, the prefix is ​​dispensable.