which可以用在句首?怎么个用法?

which可以用在句首?怎么个用法? that which 在宾语丛句中的用法 likewise的用法一般是用在句首、句中还是句末?还是说都可以? as 的用法1、as引导的定语从句可放在句首、句中和句尾,which引导的定语从句只能放在句尾.As we all know,the earth is round.David,as you know,is a photograopher.戴维是个摄影师,你是知道的.(不可用which) Li Min 语法分析,下句中的which是什么用法He came back late ,by which time all the guests had already left .which怎么能修饰time呢,它不是个连词吗 定语从句中 in which怎么用啊（好像是什么句尾in提前）求具体用法 instead在句尾怎么用法 which和that的用法```怎么区别啊?1.The house (which) they built in 1987 stayed up in the earthquake.2.A house (that) is built on sand may fall down in an earthquake.上面两句的which和that用的对吗?可以互换吗?为什么?ps：people_ 动词在句末的用法动词放在句末 怎么用 where和which用法的区别?好象一个是关系代词 一个是关系副词.但不知道实际在句中怎么用.感觉都一样!哪个高手来教我 as与which引导定语从句有什么不同用法```具体怎么用``在什么时候能用as`在什么时候能用which`` at which,in which,on which,for which,by which,from which的用法不要例句!要准确用在定语从句中等于什么! where which that的用法怎么用啊,which that可指物,where呢举例啊,好像是什么从句的用法 在定语从句中which和that的用法区别不要把有关定语从句的内容全部堆上来我只问什么时候只能用that,什么时候只能用which最好举一二个例子就可以了thanx 英语中一般过去时用法?怎么用?麻烦写个例句.一般过去时的定义、用法、例句（详细些）肯定句、疑问句、否定句 关于in which 的用法we were put into a position in which we had either to accept we were less important ,or fight the government.在这句话里,为什么要用in which ,用THAT可以吗 用 instead 放在 句中的用法 I was shocked by the news,which made me realize what(how) terrible problems we would face.用what还是how'以及在此句中的用法区别?