定从中只用That不用which的情况1.在there+be的句型中,句子的主语是先行词,而且又是物。例如:TherearetwonovelsthatIwanttoread.我要读的有两本小说。Thereisnoworkthatcanbedonenow.没有什么工作现在能做的了。2.先行词是最高级或被最高级修饰时3.以Hereis(are)开头的句子时。例如:Hereisafilmthatwillmoveanyone.这是一部将使任何人受感动的电影。HerearetwobooksthatIwillbuy.这是我要买的两本书。4.Itis(high)time+定语从句中。例如:Itistimethatweshouldhavearest.我们应该休息了。Itishightimethattheystartedout.他们该动身了。5.当先行词是way等词时,关系代词用that或者inwhich在定语从句中作方式状语时,在口语中,常可省略。例如:Thisisthewaythatmyfatherdidthiswork.这就是我父亲做此工作的方式。SheadmiredthewayinwhichIansweredthequestions.她羡慕我回答问题的方式。6.在双重限定性定语从句中,如果一个从句用who或者which引导时,那么另一个从句用that引导。例如:HeisthestudentthatIhaveeverseewhocanjumphighest.他是我曾经看到过跳得最高的学生。Mybrotherstudiesintheschoolwhichisthemostbeautifulinourcitythatisn’tfarfromhere.我的弟弟在我们的城市最美丽的学校读书,并且离这儿不远。7.当先行词被thelast,thevery和theonly修饰时。例如:ThisistheverypenthatIamlookingfor.这正是我找的钢笔。TheonlybookIwanttoreadismissing.我唯一想看的书不见了。8.在强调句子中,并且以who,which,what开头时。例如:Whowasitthatwaslost?究竟是谁迷路了?(此句中,最好不用who来代替that,避免重复。)Whatwasitthatyoudidlastweek?你上周究竟做什么了?9.当先行词有序数词时。例如:YouarethefirstpersonthatIwanttoaskfor.你是我要见的第一个人。ThisisthesecondbookthatIhaveeverwritten.这是我写的第二本书。10.当先行词被all,every,no,some,few,little,much,both等修饰时,例如:ThisisallthatIwanttosayatthemeeting.这就是我在会上要说的。Haveyouanybooksthatareworthreading?你有值的看的书吗?11.当先行词既指人又指物时。例如:TheprofessorandhisachievementthatIheardaboutareadmiredbythem.我听说的那位教授和他的成就得到他们的赞美。Let’stalkaboutthepersonsandthethingsthatwecanremember.让我们谈论能够想起的人和事。12.当先行词为something,anything,everything,nothing时,EverythingwehaveseeninChinaismoving.我们在中国看见的东西件件感人。Ihavenothingthatisworthreading.我没有什么值得一读的东西。13.当先行词是疑问代词who时。例如:Whothatyouhaveeverseencanbeathiminchess?你曾见过谁能在棋艺上打败他?