1)修饰形容词或副词时，通常放在前面。
2)当句子的谓语动词是行为动词时，频度副词一般放在谓语动词之前。句中有be或助动词、情态动词时，放在其后。
【例如】
I often go to the cinema on weekend with my husband. I can hardly understand him for what he said was really confusing.have never been abroad until now.
3)程度副词修饰形容词或副词，通常放在被修饰的形容词之前。但是enough总是放在所修饰的形容词或副词之后。
【例如】
The boy didn't work hard enough. He is quite diligent. But his achievement is not good enough.
4) only的位置比较灵活,修饰哪个词，就放在哪个词的前面，以示强调。
【例如】
I only saw John yesterday. I didn't see his wife. I have bought two kilos of potatoes only. Only in the afternoon, can you borrow books from the university library.
副词的作用与构成
副词用来修饰形容词、副词和动词。大部分副词由"形容词＋ly"构成，如：happy→happily, slow→slowly, wonderful→wonderfully等。但有些以ly结尾的词却不是形容词，而是副词，如：friendly, brotherly, likely, lonely等。有些词可以作形容词也可以作副词，如：early, late, fast, hard, low, much, near等。
