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有关副词的重要注释： asas常构成一些词组：as soon as, as well as, as+形容词/副词+as possible。如：Please ring me up as soon as you get to Beijing./ Miss Gao hurried to the school gate as quickly as possible. [注释] as long / much as + 名词可以表示长达/多达的含义。如：The house costs as much as five hundred thousand yuan./ They stayed in the caveas long as two weeks. later、after、ago、before的用法：①一段时间+later/ago分别表示以后/以前,主要用于过去时态。②after/before+某个时刻分别表示在某时刻之后/之前,此时两个词是介词。③ago与before：ago只能用于过去时,before用于完成时。如：He had an accident a week ago./ Some years later, the boy became a very famous singer./ Have you been there before?/ After a few years he gave up smoking. above、below、over、under的用法：在上下方用above和below,在高低处用over和under.如：The stars are high above in the sky. / A plane flew over quickly. 当above、below、over、under是介词性质时,意义相似。 too、also、either、nor的用法：too用于肯定句和疑问句的末尾,且用逗号隔开;also用于肯定句句子谓语动词之前;either用于否定句末尾,也用逗号隔开;nor用于倒装句句首;如：Are you American,too?/ He is not happy and I am not happy, either. / He didnt watch the football game. Nor did I./ You can also find the market is very good. | 
