adv是副词。副词是指在句子中表示行为或状态特征的词，用以修饰动词、形容词、其他副词或全句，表示时间、地点、程度、方式等概念。副词可分为：时间副词、频率副词、地点副词、方式副词、程度副词、疑问副词、连接副词、关系副词、表顺序的副词。

副词有哪些

频率副词：always、sometimes、often/frequently、normally/generally、usually、occasionally、seldom、rarely/hardlyever、never、......

方式副词：cheerfully、efficiently、painfully、secretly、quietly、peacefully、carefully、slowly、badly、closely、easily、well、fast、quickly、......

时间副词：now、yesterday、soon、later、tomorrow、yet、already、tonight、today、then、lastmonth/year、......

地方副词：off、above、abroad、far、on、away、back、here、out、outside、backwards、behind、in、below、down、indoors、downstairs、etc.....

学位副词：quite、fairly、too、enormously、entirely、very、extremely、rather、almost、absolutely、just、barely、completely、enough、.......

确定性副词：apparently、clearly、definitely、doubtfully、doubtlessly、obviously、presumably、probably、undoubtedly、...

态度副词：frankly、fortunately、honestly、hopefully、interestingly、luckily、sadly、seriously、surprisingly、unbelievably、.....

审判副词：bravely、carelessly、fairly、foolishly、generously、kindly、rightly、spitefully、stupidly、unfairly、wisely、wrongly.....

联合副词（连词副词）：besides、comparatively、conversely、equally、further、hence、incomparison、incidentally、namely、next、now、rather、undoubtedly、additionally、anyway、certainly、elsewhere、finally、inaddition、incontrast、indeed、moreover、nonetheless、similarly、subsequently、thereafter、yet、also、meanwhile、consequently、nevertheless、....