Adverb

• Degree adverbs
• Scope adverbs
• Time adverbs
• Tone adverbs
• Negative adverbs

Potential content

• Can't be reduplicated (although reduplicated adjectives can be converted into adverbs with 地, e.g. 急急匆匆地).
• Can't be used as answers to questions.
• Can't modify nouns.
• Can't precede subjects (in general).
• Some adverbs can function as linking words (conjunctions). E.g. 就
• Always appear before a verb or adjective.
• 都
• 也

Sources

• 外国人实用汉语语法(中英文对照) (pp. 105 - 116)