1. later、after、ago、before的用法：①"一段时间+later/ago"分别表示"(多久)以后/以前",主要用于过去时态。②"after/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.(一周前出了一个事故)/ Some years later, the boy became a very famous singer.(数年后这个男孩成了著名的歌唱家)/ Have you been there before?(你从前到过那儿吗?)/ After a few years he gave up smoking.(过了几年他戒了烟。)

　　2.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.(星星高挂在空中) / A plane flew over quickly.(一架飞机从头顶飞过。)

　　当above、below、over、under是介词性质时,意义相似。

　　3.as…as…常构成一些词组：as soon as…(一旦…就…), as well as…(同样), as+形容词/副词+as possible(尽可能……地)。如：Please ring me up as soon as you get to Beijing.(请你一到北京就给我写信。)/ Miss Gao hurried to the school gate as quickly as possible.(高小姐尽快地赶到了校门口。)

　　[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.(那幢房子花费高达50万元。)/ They stayed in the cave(山洞)as long as two weeks.(他们呆在山洞里长达两周。)

　　4. too、also、either、nor的用法：too("也")用于肯定句和疑问句的末尾,且用逗号隔开;also("也")用于肯定句句子谓语动词之前;either("也")用于否定句末尾,也用逗号隔开;nor("也不")用于倒装句句首;如：Are you American,too?(你也是美国人吗?)/ He is not happy and I am not happy, either.(他不愉快,我也不。) / He didn't watch the football game. Nor did I.(他没有看足球赛,我也没有。)/ You can also find the market is very good.(你还可以发觉那个市场很好。)

　　5. enough、too、so、very、quite、very much的用法： enough ("足够,十分")放在形容词或副词之后;too("太")、very("非常")、quite("相当")、so("如此地")等放在形容词或副词之前,verymuch("非常")放在动词之后。如：It's too/so/very/quite expensive.(它太贵/那么贵/非常贵/相当贵。)/ I don't like sweets very much.(我不很喜欢糖果)

　　[注意] very与 much的区别：very修饰形容词、副词的原级和现在分词形容词,much修饰形容词和副词的比较级;much还可以修饰疑问句和否定句中的动词,very不可以。如：He is very stupid.(他很笨)/ The film was very moving and everyone swept.(电影非常动人,大家都哭了)/ You must work much harder or you will fail to enter the good school.(你得学习更努力,不然你考不进那所好学校)/ I don't like him much.(我不太喜欢他)

　　6. sometimes、 sometime、 some times 、some time的用法：sometimes(有时)用于一般现在时、 sometime(在将来某时)用于将来时、 some times(数次)表示次数、some time(一些时间)表示一段时间。如：Sometimes they go hiking in the mountains.(他们有时徒步旅行到山里去)/ I will stay here some time.(我会在这儿呆些时候的。)/ I will meet your father sometime.(我什么时候要见见你的父亲。)

　　7. how、what用于感叹句的用法：对句子中的形容词或副词感叹时用how,对人或事物(可能含有形容词作修饰语)进行感叹用what. 如：What a fine day (it is) today!(今天天气真好!) / How difficult (the problem is)!((问题)真难呀!)

　　8.already、yet的用法：在完成时中,already一般用于肯定句,yet一般用于否定句和疑问句。如：Have you done it already?(你已经做好了?) / I have not had my breakfast yet.(我还没有吃早饭呢。)

　　9. hard与hardly的用法：hard作为副词意思是："努力地,猛烈地",hardly是否定词,意思是："几乎不",一般与情态动词can/could连用。如：They study English very hard.(他们英语学得很刻苦)/ You can hardly see a person spit in a public place.(在公共场所你几乎看不到一个人随地吐痰)

　　10. like...very much、like...better(=prefer)、like...best的用法：三个短语分别表示"非常喜欢"、"更喜欢"、"最喜欢"。如：I like baseball very much.(我非常喜欢棒球)/ Do you like butter better than cheese?( / They like hamburgers best.

　　11."quite/what+a+形容词+名词"的用法：记住：①quite/such/what...+a+形容词+名词;②too/so/how+形容词+a+名词;③rather+a+形容词+名词 = a+ rather+形容词+名词。如：I have never seen such a strange guy(家伙).(我从未见过这样奇怪的家伙) / It is quite a nice day for a walk.(这真是散步的好日子)