1、定语从句中关系代词只能用that引导的几种情况 (1) 如果先行词是all, much, anything, something, nothing, everything, little, none等不定代词，关系代词一般只用that，不用which。例如： Is there anything that I can do for you?(2) 如果先行词被the only, the very, the same, the last, the best等词修饰，关系代词常用that(指人时，可以用who),例如：This is the very bo
2、ok that I want to find.That is the best film that we have seen. (3) 当先行词被all, every, no, some, any, little, much所修饰时；You can take anyseat that is free.(4) 当先行词被序数词或形容词最高级所修饰时。It is the first foreign book that I have ever seen.This is the most beautiful flower that I have seen.(5)
3、在there be句型中，常用that.There is a man that lives in that village.(6) 先行词有两个，一个指人，一个指物，关系代词应该用that。例如： The boy and the dog that are in the picture are very lovely.
