赖世雄教你学英语语法
关系词
6-10：准关系代词but的用法
but做准关系代词时，只用于“no+名词”之后；此时，but等于who(whom,which)...not。
句型如下：
there is no+名词+who/whom/which/(that)...not
1.形容词从句中有be动词时，保留该be动词。
例：there is no one who is not interested in it.
=there is no one but is interested in it.
（没有人不会对它感兴趣。）
there is nothing which he is not fond of.
=there is nothing but he is fond of.
（没有什么东西是他不喜欢的。）
2.形容词从句中有一般动词（can,will,may,should...）时，保留该助动词。
例：there is nothing that he cannot do.
=there is nothing but he can do.
（没有什么事情是他做不来的。）
3.形容词从句中有do,does,did等助动词时，要先去掉do,does,did,再依时态、人称将之后的动词还原。
例：there is no book which he doesn't like to read.
=there is no book but he likes to read.
（没有他不爱读的书。）
there was no one whom he didn't hate.
=there was no one but he hated.
（没有什么人是他不讨厌的。）