1) but表示转折,while表示对比。来源:考试大 Some people love cats, while others hate them.
典型例题 --- Would you like to come to dinner tonight? --- I d like to, ___ I m too busy. A. and B. so C. as D. 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。来源:考试大
2) not…but… 意思为"不是……而是……" 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.