在定语从句中,关系代词who (whom)和that都可指人和物,在一般情况下,可以互换使用,当关系代词指人时,关系代词既可用who,也可以用that.
1. 两者均可指人,有时可互换(包括当先行词为 all, anyone, someone等,同时也包括先行词受the only等的修饰时):
All that [who] heard him were delighted. 所有听了他讲话的人都很高兴。
2. 但是在下列情况,通常要用 that:
①当先行词是一个既指人又指物的并列词组时:
I made a speech on the men and things that I had seen abroad. 我就我在国外所见到的人和事作了报告。
②当先行词是who时(为避免重复):
Who was it that won the World Cup in 1982? 谁赢得了1982年的世界杯?
③当关系代词在定语从句中作表语时(可省略):
Tom is not the boy (that) he was. 汤姆这孩子已不是以前那个样子了。
3. 但是在下列情况,通常要用 who:
当先行词为 those 且指人时,英语习惯上要用 who 来引导定语从句。如: Those who do not wish to go need not go. 不愿去的人不需要去。
Those who couldn’t walk were carried on stretchers. 那些不能走的人都用担架抬着。
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