3 非限制性定语从句中which指代前面的事情
关于非限制性定语从句中的先行词which，请看下面我写的两个句子是否有问题？
Nowadays, an increasing number of people are learning online, which has both advantages and disadvantages.
这个句子想表达在网上学习这件事有好有坏（而不是越来越多的人采用这种方式有好有坏），那么which指代的就不是前面的句子了，而是are learning online这个谓语动词的词组了。
It's important to clean our teeth everyday, which can help us keep healthy.
这个句子想用后面的定语从句表达每天刷牙可以帮助我们保持健康，但细究的话which就指代前一句的to do 不定式了。
正常学的定语从句的which，要么指代名词，要么指代前面整个句子，像这两个例句这样是不是有问题？希望有老师能给与指导。
非常感谢！
最佳答案 2022-03-04 15:00
我们看一下夸克的例句：
They say he plays truant, which he doesn't. [l]
He walks for an hour each morning, which would bore me. [2]
以上两个句子中，which的先行词无疑不包括句子的主语，而只是黑体部分, 即先行词为谓语动词+宾语或状语，即谓语部分。二个句子不同之处在于，第一句中的which表面上看等于play truant, 实际是doesn't后省略了do，which意为it。而第二句则which直接等于it，it指代walking for an hour each morning.
Things then improved, which surprises me. [3]
Colin married my sister and I married his brother, which makes Colin an! me double in-laws. [4]
以上二个句子中，which的先行词为前面整个主句的内容。
我们再看剑桥英语语法的例句：
He told me to design it myself, which I simply can't.
They advised me to call the police , which I did immediately.
这二个例句显然which的先行词为主句中的动词不定式。
改为并列句结构，则上述二句分别为：
He told me to design it myself, but I simply can't do it.
They advised me to call the police, and I did it immediately.
以上二句删去并列连词，用which替换it，就得到这种句子关系分句。
所以，which引导非限制性定语从句，其先行词既可以是前面整个主句的内容，也可以是主句的谓语动词，以及非谓语动词部分。夸克把这种which从句称为句子关系分句sentential relative clause，剑桥英语语法把这种which分句称为补充语分句supplementary clause
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其它 3 个回答
这个问题其实是很好的问题。Ethan999的 回答是没问题的。我只是想多说一个当代的语法书上很少提及的术语“接续性从句”，这个说法在旧一点的语法书上都有。当代绝大多数语法书都会说非限制性定语从句，那which到底指代什么，可以指代什么？你的困惑就在于此！其实，我们如果按照接续性从句来理解，就好理解多了：
1.Nowadays, an increasing number of people are learning online, which has both advantages and disadvantages.=Nowadays, an increasing number of people are learning online, and it has both advantages and disadvantages.想想it指代什么，既然是代词，那就可以指前面整句，当然也可以指前句中的一部分，好理解了吧！
你后面的那句同样如此。
接续性从句把which一般理解成连词and+代词it。代词it具体指代什么，看句意，可能是前面整句，也可能是其中的一部分。这只是一种帮助我们理解的方法而已。
没有问题. 非限定从的which可以指代前句的某个词, 短语,整个句子,都可以, 很灵活.
1. Nowadays, an increasing number of people are learning online, which has both advantages and disadvantages. 这个定语从句只能修饰前面整个句子。如果仅修饰后面learning online, 英语不这么说。可以说：Nowadays, an increasing number of people choose/prefer online learning which has both advantages and disadvantages. 这种表达which 前不能有逗号，否则属于产生歧义的句子。
2. It's important to clean our teeth every day, which can help us keep healthy. (你的every day 要分成两个词）
英语一般不这么表达，which 从句指代不准确，因为保持健康和重要都是指刷牙。改为：1. It's important to clean our teeth every day; it can help us keep healthy. 2. It's important to clean our teeth every day because it can help us keep healthy. 3. It's important to keep us healthy by cleaning our teeth every day.
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