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. 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。
2) notbut 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 of a human being.
上一篇： 比较may和might
下一篇： 判断关系代词与关系副词