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连词1)and 与or判断改错： (错) They sat down and talk about something. 　(错) They started to dance and sang. 　(错) I saw two men sitting behind and whisper there. 　(对) They sat down and talked about something. 　(对) They started to dance and sing. 　(对)I saw two men sitting behind and whispering there.(错) They sat down and talk about something. 　(错) They started to dance and sang. 　(错) I saw two men sitting behind and whisper there. 解析：第一句： and 连接两个并列的谓语，所以 talk 应改为 talked。 　第二句：and 连接两个并列的动词不定式，第二个不定式往往省略to，因此sang 应改为 sing。 　第三句：and 连接感观动词saw 后面的用作的宾补的两个并列分词结构，因此whisper应改为whispering。Make up your mind, and youll get the chance. = If you make up your mind, youll get the chance. 　One more effort, and youll succeed. 　= If you make one more effort, youll succeed.注意：and 还可以和祈使句或名词词组连用表示条件。Make up your mind, and youll get the chance. = If you make up your mind, youll get the chance. 　One more effort, and youll succeed. 　= If you make one more effort, youll succeed.2)both …and两者都She plays (both) the piano and the guitar3)not only…but (also), as well as不但…而且She plays not only the piano, but (also) the guitar. 　注意： not only… but also 关联两个分句时，一个分句因有否定词not 而必须倒装 　Not only does he like reading stories, but also he can even write some. 4)neither…nor意思为既不……也不……谓语动词采用就近原则，与nor后的词保持一致。 　Neither you nor he is to blame. but表示转折，while表示对比。Some people love cats, while others hate them. 典型例题 　--- Would you like to come to dinner tonight? 　--- Id like to, ___ Im too busy. 　A. andB. soC. asD. but 　答案D。but与前面形成转折，符合语意。而表并列的and， 结果的so，原因的as都不符合句意。表原因关系1) for判断改错： 　(错) For he is ill, he is absent today. 　(对) He is absent today, for he is ill. 　for是并列连词，不能置于含两个并列分句的句子的句首，只能将其放在两个分句中间。比较so和 such其规律由so与such的不同词性决定。such 是形容词，修饰名词或名词词组，so是副词，只能修饰形容词或副词。so 还可与表示数量的形容词many，few，much， little连用，形成固定搭配。so + adj.such + a(n) + n. 　so + adj. + a(n) + n.such + n. (pl.) 　so + adj. + n. (pl.)such +n. (pl.) 　so + adj. + n. [不可数]such +n. [不可数] 　so foolishsuch a fool 　so nice a flowersuch a nice flower 　so many/ few flowerss