定语从句什么时候不能用which
1.当关系词前面有介词时，指物常用which. 如·The prize for which he worked so hard was a new bike. He built a telescope through which he could study the skies.(2) 非限制性定语从句指物时，多用which. 如He wrote an article, which tells us about the computer. (3) 如果先行词本身是that时，只用which.如This is that which he bought yesterday.(4) which还有一种特殊用法，它可以引导从句修饰前面的整个主句，代替主句所表示的整体概念或部分概念。在这种从句中，which可以作主语，也可以作宾语或表语，多数情况下意思是与and this 相似，例如： He succeeded in the competition, which made his parents very happy.。。。没了。。= =
定语从句中不能用“which”的几种情况
1.当先行词为all, little, much, few, everything, none 等不定代词时关系代词用that而不用which. i will tell him all that you told me at the ball. there are few books that you can read in this book store. 2.当先行词既有人又有物时,关系代词用that, 不用which. he asked about the factories and workers that he had visited. 3.当先行词有形容词最高级修饰时,关系代词用that, 而不用which. this is the best novel that i have ever read. guilin is one of the most beautiful cities that i have ever visited. 4.当先行词有序数词修饰时,关系代词用that, 不用which. the first sight that was caught at the great wall has made a lasting impression on him. 5.当先行词被the only, the very, the same, the right等修饰时,关系代词用that,不用which. that is the very thing that we can do. it is the only book that he bought himself. 6.当先行词被all, every, any, much, little, few, no等修饰时,关系代词用that,不用which. you can take any room that you like. there is no clothes that fit you here. 7.当主句是以which开头的特殊问句时,定语从句关系代词一般用that而不用which. which of the books that had pictures was worth reading? 8.在强调句型" it is ... that ..." 中,只用that,不用which. it is in this room that he was born twenty years ago. 9.在" such (the same) ... as ..." 句型中,关系代词要用as, 而不用which. we need such materials as (not which) can bear high temperature. 10.表示" 正如... 那样 "," 正象..." 之意时, 用as, 不用which. mary was late again, as had been expected. 11.as 引导的定语从句可以放在主句前面, 也可以放在主句后面或主句中间,而由 which引导的定语从句只能放在主句后面。
亲们，急问，这道题为什么用which而不用where
您好，这就话可以这样理解 she often parks her car(near the house)___she can easily get to. 空格前的 near the house 是状语可以省略不看，整个从句修饰的是名词her car,既然修饰的是名词，就是定语从句，其次从句 she can easily get to (get to sth)缺少的是宾语，在定语从句中可以充当宾语的连词有 whom.which.that,因为被修饰词是物，所以用which.
定语从句中，从句结构完整，关系词为什么不能用which？
因为关系词 which 属于关系代词（相当于名词），而定语从句的语法规定是关系词必须在定语从句中充当一个成分。
这样就说明定语从句缺少一个代词/名词性的成分，而代词/名词在一个句子中一般都是充当主语/宾语/表语的。这三个成分在句中都属于主干，缺少的话，句子是不可能完整的。
所以，如果定语从句如果结构完整，则定语从句是不可能用关系代词（包括which 在内）引导的。
反之，关系副词在定语从句中一般充当状语，状语在句中则属于附加成分。句子缺少状语后还是基本完整的。所以说，如果定语从句结构完整，则说明关系词一般都是关系副词when/where/why等。