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where，when是关系副词当先行词是when且定语从句中不缺少主，谓，宾时使用when引导定语从句；当先行词是place的时候且定语从句中不缺少主，谓，宾时用where；who,which,that,是关系代词当先行词与定语从句有所属关系时用whose例如: givemethebook whosecoverisred 当先行词是物时用whichthat即可以修饰人也可以修饰物以下几点时只用that不用which（1）当先行词被最高级修饰时用that（2）先行词被all，little，等修饰用that（3）先行词被序数词修饰用that（4）当先行词是everything,something,anything,nothing,等词用that（5）当先行词中同时出现人和物时用that （6）当先行词中有the same,the very,the only表示强调时用that 当that在定语从句中作宾语可以省略关系副词可以换成介词+which的形式当介词在句末时可以省略例如：thisistheshopwhichibroughtmywatchfrom此时which可以省略 |
