副词在句中主要用作状语，修饰动词、形容词、副词、介词短语或句子。
⑴ 修饰动词，表示时间、地点、程度、方式、频度等。一般位于动词之后，如果动词有宾语，则要位于宾语之后。频度副词常位于助动词和连系动词be 之后或实义动词之前。例如：He arrived only yesterday. 他是昨天才到的。There were clothes lying here and there on the floor. 地板上到处都是衣服。I have been terribly worried about you all day. 我一整天都非常为你担心。She plays the piano very well. 她钢琴弹得很好。The boy is always asking his parents for money. 那个男孩老是向他父母要钱。She never goes to the cinema. 她向来不看电影。
⑵ 修饰形容词、副词、介词短语，一般前置，只有enough例外，需要后置。例如：She seems quite happy. 她看上去相当愉快。Youve done rather badly in the test. 你考得够糟糕的。The wind was right in our faces. 风迎面吹来。This girl is not old enough to go to school. 这个女孩还没有到上学的年龄。He didnt run fast enough to catch the train. 他跑得不够快，没有赶上火车。
⑶ 用作表语，多为与介词同形的副词和表示方位的副词。例如：Is anybody in? 里面有人吗？有人在家吗？Father is away. 父亲离家在外。I am downstairs and my brother is upstairs. 我住楼下，我哥哥住楼上。My friend is still abroad. 我的朋友还在国外。
⑷ 少数表示地点或时间的副词还可用作定语，一般位于名词之后。例如：I hope youll enjoy your stay here. 希望你在这里过得愉快。I met a friend of mine on my way home. 在我回家的路上，我碰到一位朋友。What did you think of the meeting yesterday? 你觉得昨天的会开得怎样？
⑸ 副词的比较等级用法与形容词一样，请参见《初中英语语法专题讲座--形容词》有关内容。