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1·In 'run fast', the adverb 'fast' is a postmodifier.

在run fast中，副词fast是后置修饰词。《牛津词典》

2·In 'speak quietly', the adverb 'quietly' is a modifier.

在speak quietly中，副词quietly是修饰语。《牛津词典》

3·In 'walk slowly', the adverb 'slowly' modifies the verb 'walk'.

在walk slowly中，副词slowly修饰动词walk。《牛津词典》

4·Above (adverb) can indicate something written earlier in a book or other documents.

作为副词的 above 可指在书或文件前面写的东西。

5·A phrasal verb refers to a verb combined with an adverb or a preposition, or sometimes both, to give a new meaning.

短语动词指的是动词与副词或介词，或者有时两者结合，赋予新的意义。

6·An adverb of manner tells us how an action is done.

状态副词告诉我们一个动作是如何进行的。

7·Exactly. Fanzheng is an adverb.

韩佳：没错儿。“反正”是个副词。

8·Buding is an adverb.

“不定”是个副词。

9·Here it is an adverb.

在这里它是个副词。

10·You should run on an adverb to the verb.

你应在这动词后附加一个副词。

副词

1·Above (adverb) can indicate something written earlier in a book or other documents.

作为副词的 above 可指在书或文件前面写的东西。

2·Above (adverb) can indicate something written earlier in a book, article, or other document.

作为副词使用时，above可指在书或文件前面写的东西。

3·Once it's clear that however is just an introductory adverb, the sentence makes sense.

“However,” 在这里只是一个引导性的副词，这个句子就是有意义了。

4·The modifier (adverb or adjective in a sentence) is not required, usually.

通常不需要“修饰语”（句子中的副词和形容词）。

5·Both are an accurate representation of the adverb employed in the original text-not an adjective.

两种翻译都正确反映了原文此处所用的副词而非形容词。