the source is reliable ,i obtain the information from it.改成定语从句 我的改成：i obtthe source is reliable ,i obtain the information from it.改成定语从句我的改成：i obtain the information from which its source is reliable.我

the source is reliable ,i obtain the information from it.改成定语从句 我的改成：i obtthe source is reliable ,i obtain the information from it.改成定语从句我的改成：i obtain the information from which its source is reliable.我
the source is reliable ,i obtain the information from it.改成定语从句 我的改成：i obt
the source is reliable ,i obtain the information from it.改成定语从句
我的改成：i obtain the information from which its source is reliable.
我是不改错了
正确的是 the source from which i obtain the information is reliable
我错了的话 错在哪

the source is reliable ,i obtain the information from it.改成定语从句 我的改成：i obtthe source is reliable ,i obtain the information from it.改成定语从句我的改成：i obtain the information from which its source is reliable.我
你的改法,造成了改后主句的成分不完整,主句即i obtain the infromation from sth.但定从是不能充当这个sth的,只有名词性从句（同位语从句、宾语从句等）可以.i obtain the infromation from what...
答案是用定语从句修饰source是因为他认为该简单句就是强调了source是reliable的.主要表达的意思是前半句而不是后半句.
如果一定要让定语从句修饰information,也应该是i obtain the information of which the source is reliable.或i obtain the information whose source is reliable.切勿在从句里面想当然地用its来指代从属关系.从句虽然是为主句服务的,但主从句各自是分立完整的,拆开来看是独立的.这是个初学很容易犯的问题.以后留意就好了

楼主是以第二句话为主句进行改写，但没有弄清楚it 指什么。
it= the source。正确的句子是：
I obtain the information for the source which is reliable.
答案是以第一句话为主句改写的。

你改的也没有错啊,看要求哪个是主句哪个是从句了.

若关系代词在定语从句中作作介词宾语时，介词既可置于从句之首，亦可置于从句之末。
EG：this is the book for which you asked.
改：this is the book which you asked for.
所以若你写的句子正确，可以把你改写成i obtain the information which its source from is...

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若关系代词在定语从句中作作介词宾语时，介词既可置于从句之首，亦可置于从句之末。
EG：this is the book for which you asked.
改：this is the book which you asked for.
所以若你写的句子正确，可以把你改写成i obtain the information which its source from is reliable。
显然是错误的
你错的关键在与不知道关系代词要在从句中充当成分。its source is reliable 这个句子从语法上说是完整的，所以which无用。

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是改错了。后面的是正确的。
是定语从句， source是先行词，from which i obtain the information 是从句，这个从句是用于修饰前面的先行词的。
既然主句是the source is reliable，那你就把从句放到source的后面， i obtain the information from "the source".再用which替换sou...

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是改错了。后面的是正确的。
是定语从句， source是先行词，from which i obtain the information 是从句，这个从句是用于修饰前面的先行词的。
既然主句是the source is reliable，那你就把从句放到source的后面， i obtain the information from "the source".再用which替换source就行了。
最后再加上主句的后半段。
注意，从句只能放到先行词的后面，作插入语，起修饰作用。

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