定语从句只用that而不用which的五种情况

1）当先行词是：all,any,anything,everything,nothingtheone,much,few,little或被它们修饰时。例如：IsthereanythingthatIcandoforyou?有什么可以为你做的吗？2）当先行词被形容词的最高级或序数词修饰时。Thefirstthingthatweshoulddoistogetsomefood.我们该做的第一件事是弄点吃的。3）当先行词有：theonly,thevery,thesame,thelast等修饰时。Mynecklaceisnottheonlythingthat'smissing.我的项链不仅是丢掉的东西。4）当主句以who或which开头时，定语从句中引导词用that,不用which或who。以避免重复。Whoisthegirlthatiswearingaredcoat?正穿一件红色外套的女孩子是谁？5）当先行词既有人又有物时，用that。Thewriterandhisnovelthatyouhavejusttalkedaboutarereallywellknown.你刚才谈起的那位作家以及他的小说确实很著名。6)Therebe句型中，修饰主语的定语从句只能用thate.g.Thereisatableinthecornerthatisfoldedaway.墙角有一张折叠起来的桌子1)关系代词前有介词时，只能使用关系词which，不能使用thate.g.Therearemanytreesunderwhichtheycanhavearest.2)在非限制性定语从句中只能使用which，不能使用thate.g.Itisatree,whichIplantedthreeyearsago.只用which引导定语从句的情况