怎样区别先行词在定语从句中做不做主语The boy_______promisde not to be late for school again is my brother.A.whoB.whom

怎样区别先行词在定语从句中做不做主语The boy_______promisde not to be late for school again is my brother.A.whoB.whom
怎样区别先行词在定语从句中做不做主语
The boy_______promisde not to be late for school again is my brother.
A.who
B.whom

怎样区别先行词在定语从句中做不做主语The boy_______promisde not to be late for school again is my brother.A.whoB.whom
找到先行词 把先行词还原到定从中看是什么成分
比如你的题目 the boy is my brother是主句
( )promised not to be late for school again 是定从 缺少主语
所以用who就关系副词代替the
P.S. 一般性出现who whom,选who情况比较多 whom的用法包含于who之中
但如果是prep.且修饰人后只能用whom

那个承诺不再迟到的男孩是我的兄弟
the boy是先行词，先行词后面是一个定语从句_______promisde not to be late for school again ，主句是is my brother，从句中promisde not to be 是谓语， late for school 是表语，again是副词作为状语，显然，从句当中缺少一个主语，那么能作为主语的就只有关系代词...

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那个承诺不再迟到的男孩是我的兄弟
the boy是先行词，先行词后面是一个定语从句_______promisde not to be late for school again ，主句是is my brother，从句中promisde not to be 是谓语， late for school 是表语，again是副词作为状语，显然，从句当中缺少一个主语，那么能作为主语的就只有关系代词了，所以选who，whom只能作为宾语

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看定语从句缺什么啊

A who 把the boy放在从句中promisde not to be late for school again ， 是 the boy promisde not to be late for school again 。主语。