副词用来修饰动词,形容词,副词或整个句子.
He run fast.副词fast 修饰动词run
He run very fast.副词very 修饰副词fast
She is very beautiful.副词 very修饰形容词 beautiful
He did his homework carefully.副词carefully 做方式状语修饰整个句子.
副词修饰形容词或副词时放在所修饰词前.
副词修饰动词时放在动词之后,如果动词带有宾语,那么副词放在宾语之后.
频度副词（如：often,usually）放在be动词、助动词、情态动词后,实义动词前.