副词的概念：
副词是指在句子中表示行为或状态特征的词，用来修饰动词、形容词、其他副词、介词短语、非谓语动词乃至整个句子，表示时间、地点、程度、方式等概念。
副词的位置：
1）在动词之前。
2）在be动词、助动词之后。
3）多个助动词时，副词一般放在第一个助动词后。
注意：
a. 大多数方式副词位于句尾，但宾语过长，副词可以提前，以使句子平衡。
如：We could see very clearly a strange light ahead of us.
b. 方式副词well，badly糟、坏，hard等只放在句尾。
如：He speaks English well.
副词的排列顺序：
1）时间，地点副词，小单位的在前，大单位在后。
2）方式副词，短的在前，长的在后，并用and或but等连词连接。
如：Please write slowly and carefully.
3）多个不同副词排列：程度+地点+方式+时间副词。
注意：副词very可以修饰形容词，但不能修饰动词。
改错：（错）I very like English.
（对）I like English very much.
注意：副词enough要放在形容词的后面，形容词enough放在名词前后都可。
如：I don't know him well enough.
There is enough food for everyone to eat.
There is food enough for everyone to eat.
兼有两种形式的副词：
1）close与closely：
close意思是“近”；closely意思是“仔细地”。
如： He is sitting close to me.
Watch him closely.
2）late与lately：
late意思是"晚"；lately意思是“最近” 。
如：You have come too late.
What have you been doing lately?
3）deep与deeply：
deep意思是“深”，表示空间深度；deeply时常表示感情上的深度，“深深地” 。
如：He pushed the stick deep into the mud.
Even father was deeply moved by the film.
4）high与highly：
high表示空间高度；highly表示程度，相当于much。
如：The plane was flying high.
I think highly of your opinion.
5）wide与widely：
wide表示空间宽度；widely意思是“广泛地”，“在许多地方”。
如：He opened the door wide.
English is widely used in the world.
6）free与freely：
free的意思是“免费”；freely的意思是“无限制地”。
如：You can eat free in my restaurant whenever you like.
You may speak freely, say what you like.