定语从句中什么时候只能用who我在教学中发现有的语法书中说到在there be开头的句中只能用who,但是有的却说只能用

在以下六种情况下多用who ：
①关系代词在从句中做主语
A friend who helps you in time of need is a real friend .
②先行词为those ,people 时
Those who were either fools or unfit for their offices could not see the cloth .
③先行词为all,anyone ,ones ,one 指人时
One who doesn’t work hard will never succeed in his work .
④在There be句型中
There is a stranger who wants to see you .
⑤在被分隔的定语从句中
A new teacher will come tomorrow who will teach you German .
⑥在有两个定语从句的句子中,其一用who,其二用that,但若先行词后接两个以上的并列定语从句时,后一个必须重复前一个关系代词.
The student who was praised at the meeting is the monitor that is very modest and studies very hard .
There is a teacher who is always ready to help others and who enjoys what he does .
这是我在高中的时候做的笔记,希望对你有用.

定语从句中用that 代替who 很常见。只能用who的情况：1。当先行词含有that时避免重复只能用who. 2.在非限定性定语从句中，代人只能用who. 3.当我们很尊重先行词的时候，最好用who.
英语教授亲口所授.......
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