一、只用that 不用w hich 主句已有疑问词who 或which 先行词既有人又有物时（先行=人+物） 先行词为不定代词：thing 系列(something, everything, anything, nothing), all, much, few, little, none 先行词+形容词最高级/序数词 先行词由以下修饰：The 系列（the very, the only, the same）,any, few, little, no, all, one of, some（与3 中all 的区别） 有两定从时，一用which，则另一用that 先行前有such、the same 修饰，先行词和关系代词指同一物时（有例题，such 的意思不是“像„一样的”，与as用法做区别） There be 结构，修饰主语的定从宜用that 1、Which of the cars that are in front of the hotel belongs to you
2、He talked about the schools and teachers that he had visited
3、We haven’t got much that we can offer you
All that you need is… 4、This is the most interesting film that I’ve seen
5、This the very room that I slept in that evening
6、Edison built up a factory which produced things that had never been seen before
7、She is wearing the same dress that she
