副词主要修饰动词、形容词、副词、句子，表示方式、程度、时间、地点、让步等。
副词的构成
1、形容词+ly
sad—sadly impolite—impolitely
2、以y结尾的形容词将y变成i再加ly
happy—happily busy—busily
3、以le 结尾的形容词直接去e加y
gentle—gently terrible—terribly
4、以ll结尾的形容词直接加y
dull—dully shrill—shrilly
5、以ic结尾的形容词加ally
electric—electrically basic—basically
6、介词或地点名词+wards
downwards, upwards, southwards, onwards, forwards
7、名词+wise
weatherwise 就天气来说 moneywise 在金钱方面 lengthwise纵向地 clockwise顺时针方向
8、以a-开头的既可作形容词又可作副词:
alike, alone, amiss, aslant, astray, afloat, adrift, afire, 但有的只能作副词：
awhile， around， anew， aloud， aloft， ahead， abroad
9、与形容词同形的副词
fast hard high just late loud pretty slow straight straight well wide
副词的功能
1. 副词一般在句中表方式、程度、时间、地点、条件等状语
修饰动词
They completely agreed with me.
修饰形容词
He had an unusually strong personality.
修饰副词
Please help him right now.
2. 副词在主系表结构中作表语
The kitchen is below.
The meeting is over.
3. 时间副词、地点副词置于被修饰的名词之后作定语
The meeting today is boring.
The bedroom upstairs is small.
副词的比较级和最高级的构成和用法与形容词相同，只是副词最高级前可以不加the
She plays basketball better than I.
She speaks English best among us.
