在某些“副词十形容词十名词”结构中,不定冠词a(an)可置于形容词之后或副词之后.当形容词前面有how,as,so,too等副词作修饰语时,a(an)应置于形容词之后.如:How great a mistake you are in!你所犯的错误是多么严重呀! In some of the “adverbs ten adjective ten nouns” structure, the indefinite article a(an) can be placed after an adjective or after an adverb. When adverbs preceded by adverbs such as how,as,so,too, are used as modifiers,a (an) Should be placed after an adjective. Such as: How great a mistake you are in! How serious is your mistake!