I will never forget the day,on "which" I first saw him. 答案唯一，不用that，不能省
I'm sure there's nothing "that"our monitor can't do. 先行词是nothing、anything，everything等只用that，本题在从句作宾语所以可省
That book is the first/ last (one)"that" he bought in biggest bookshop in our city.有序数词或最高级只用that
定语从句有时答案不唯一
this is the factory in which/ where he works.
this is the factory that/ which produces cars.主语不能省
this is the factory that/ which/不填 he used to work in.
this is the factory, which produces cars. 非限制性定语从句，that不能填
请参考一下
用到关系代词就不是后置定语而是定语从句了。
当先行词也就是关系代词前面的那个名词，为各种不定代词，或被the,some,every 等词修饰时，只能用that.
定语从句的引导词分成关系代词和关系副词。介词+which=关系副词，看先行词在从句中作什么成分。
内容全部来源于网络收集，如有侵权，请联系网站删除：QQ：24596024