10.  already一般用于肯定名,也可用于预料能得到肯定回答的疑问句中,表示某事已发生;yet一般用于否定句或疑问句中位于句末,意为“还,已经”;still一般用于肯定句,也可用于疑问句,意为“仍然,还”。Eg: I have already read the book./ We haven’t made speeches yet./ Is my skirt dry yet?/ I still hope to get some advice from you on my studies.            11. faily,rather,quite                        A.三者都可以修饰形容词和副词,都有“相当”的意思,但failry词义最弱,quite稍强,rather最强。Fairly一般表示肯定、褒义,rather有时表示否定、贬义。It is fairly cool today. It is rather cold today.              B、quite和rather可以修饰动词,而fairly不能。  I don’t quite understand what you said./ I rather like the song.                12.  so,neither,nor                          so可用在“so+助动词+主语”的倒装结构中,表示“也”,位置在助动词前,so的这种用法只能在肯定句里;在否定句中用neither或nor,结构相同,表示“也不”。                   He has seen the film. So have I .                   Jim doesn’t like the novel. Neither (Nor) does Linda.             13.  ago, before                           A “时间段+ago”表示从现在往前推算的“一段时间以前”,而“时间段+before”表示从过去某时刻再往前推算的“一段时间以前”。因此,前者常与一般过去时连用,后者常与过去完成时连用。He bought a violin a week ago. From his letter I knew that he had bought a violin a week before            

B before可表示不确定的过去,而ago则不能: Have you been there before?                      14. 像afraid, alive, awake, asleep, alone以“a”开头的形容词,一般不能用very修饰。                             15.  deep与deeply都可作副词,但意义不同:deep指的是深浅的“深”,如:dig deep。Deeply的意思是“涂地、深刻地、深厚地”,有引申含义。如:We are deeply moved by his deeds.(还有high,highly)                   16. not是副词,不能直接修饰名词,no是形容词,能位于名词前作定语,有时no=not any。如: I have no brothers=I have no any brothers

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