关于who和whom的用法,0aHe ofen helps the students who he thinks are not ...

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关于who和whom的用法,0aHe ofen helps the students who he thinks are not ...
关于who和whom的用法,0aHe ofen helps the students who he thinks are not quick at their study.为什么用who,为什么要作主语啊,不是宾格吗?求详解,尽量详细一点,我方便理解.

who在从句中作的是主语,所以要用这种形式,he think 是做为插入语的,不算句子成分的.如果他在从句中是在for等介词后面就是用的whom或者是who,这两种都可以