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1、表示选择的并列结构1) or意思为 否则 。I must work hard, or Ill fail in the exam.2) eitheror 意思为 或者 或者 。注意谓语动词采用就近原则。Either you or I am right.表示转折或对比1) 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
2、D。 but 与前面形成转折，符合语意。而表并列的符合句意。2) notbut意思为 不是 而是 and， 结果的so，原因的as 都不not和 but后面的用词要遵循一致原则。They were not the bones of an animal, but (the bones) of a human being.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，2) so, therefore
3、He hurt his leg, so he couldnt play in the game.只能将其放在两个分句中间。注意：a.两个并列连词不能连用，但therefore, then, yet.可以和并列连词连用。You can watch TV, and or you can go to bed.He hurt his leg, and so / and therefore he couldnt play in the game.b. althoughyet ，但 although不与 but连用。( 错 )Although he was weak, but he tried his best to do the work.( 对 )Although he was weak, yet he tried his best to do the work.感谢您的阅读，祝您生活愉快。
表示选择的并列结构
