（1）副词在句子中的主要作用：副词在句子中主要作状语，用来修饰动词、形容词和副词。例如：This kind of skirt looks nice and sells well．这种衬衫看上去不错很好卖。
It rained hard．People could hardly go out．
We can't put this basket in the car．The car's too full．
The sweater is very beautiful，but it's much too dear．
（2）注意事项：①already和yet都表示“已经”。但是，already用于陈述句，而且事情早先已经发生，或比期望发生的要早，它一般用在句子中间，但不能和时间状语放在一起。yet用来谈某事在预料之中，用于疑问句和否定句，一般放在句末。
例如：The teacher is too busy．She hasn't had her lunch yet．
I haven't finished my homework yet．
②ever用于疑问句或带if的肯定句中或含hardly等否定意义的肯定句中，表示“曾经”，一般要放在动词旁边；它不用现在完成时的简略回答，而要用Yes，I have或No，never来表示。never，hardly，seldom都是表示否定意义的副词，置于行为动词之前，或者两个动词之间。例如：
She doesn't like watching TV．She never watches TV．她不喜欢看电视。她从不看电视。
③either用于否定句的句末，意为“也”。例如：
Lucy doesn't like cotton blouses．Lily doesn't，either．露茜不喜欢棉衫，莉莉也不喜欢。
（3）副词在句子中的位置
①多数副词可以放在动词后面，如果是及物动词，一般放在宾语之后。例如：
Don't worry．The boy can do it very well．别担心，这个男孩能把它做的很好。
The picture is too small．I can't see it clearly．图画太小了，我看不清楚。
②频度副词always，often，sometimes，usually等通常放在行为动词之前，助动词、系动词或情态动词之后。例如：
The first class always begins at eight．第一节课总是八点开始。
How do you usually go to school？你平时是怎样上学的？
The boy is often late for class．那个男孩经常迟到。
③enough作副词修饰形容词或副词时，应放在所修饰的词之后。例如：
He wasn't careful enough with the knife．He cut himself．
Jack didn't run quickly enough to catch the bus．
