关系代词that的用法1）不用that的情况a)在引导非限定性定语从句时。(错)Thetree,thatisfourhundredyearsold,isveryfamoushere.b)介词后不能用。Wedependonthelandfromwhichwegetourfood.Wedependonthelandthat/whichwegetourfoodfrom.2)只能用that作为定语从句的关系代词的情况a)在therebe句型中，只用that，不用which。b)在不定代词，如：anything,nothing,theone,all,much,few,any,little等作先行词时，只用that，不用which。c)先行词有theonly,thevery修饰时，只用that。d)先行词为序数词、数词、形容词最高级时，只用that。.e)先行词既有人，又有物时。举例：Allthatisneededisasupplyofoil.所需的只是供油问题。Finally,thethiefhandedeverythingthathehadstolentothepolice.那贼最终把偷的全部东西交给了警察。
