2 which it is expected定语从句
They rolled out a product which it is expected would be beneficial for the blind.
请问老师，it is expected是嵌入式定语从句吗？which引导的定语从句做it is expected的实际主语？
最佳答案 1天前
陈才老师的解答已经很完美了。我按《剑桥英语语法》的解释结合自己的理解，在此补充一下。
《剑桥》虽未对关系代词在主语从句中作成分的情况予以分析，但按《剑桥》的理论，这句话的确是嵌入式关系分句：
They rolled out a product [which it is expected [_would be beneficial
for the blind]]. 外括号包含的是关系分句，修饰 product（《剑桥》提到先行项时，不含冠词 a，故在此遵循这一说法），内括号包含的分句（即传统语法所说的“主语从句”）嵌入到该关系分句中。其中_（空位（gap））是在主语从句中作主语的关系代词 which/that。《剑桥》提到嵌入式分句（Embedded clause），而未专门提及嵌入式关系分句，但将此类嵌入式分句细分为“嵌入式关系分句”完全没问题。
与关系代词在宾语从句中作主语时，连词 that 不可出现同样道理：这句话中 expected 后不可出现连词 that（倘若出现，会有歧义，读者不知这个 that 是引导连词还是关系代词）；而关系代词在主语从句中作宾语或表语时，连词 that 可省或可不省，因为无歧义。
另外需要说明的是，网友的例句中的关系代词 which 完全可以省略：The novelty of the idea coupled with the lack of data to prove the
social and economical benefits it was claimed came from senior cohousing made
it difficult for decision makers and stake holders to get on board.（外刊例句）。
再贴个未省略关系代词的例句：More interesting than his speech is where he chose to live: not Shanghai or Guangzhou but Beijing, a city that it is said has a history of over 5,000 year.（《经济学人》）。
其它 1 个回答
They rolled out a product which it is expected would be beneficial for the blind.
it is expected是嵌入式定语从句吗？which引导的定语从句做it is expected的实际主语？
建议网友最好这样表述：which引导的定语从句实际上是一个主语从句：It is expected that which would be beneficial for the blind，关系代词which在主语从句中作主语。(It is expected为定语从句的主句内容，that which would be beneficial for the blind为主语从句的真正主语。which引导的定语从句包含“主句(it is expected)+从句(that which would beneficial for the blind. which指代前面先行词a product。)
They rolled out a product which it is expected would be beneficial for the blind.
解答如下：首先可以肯定，网友理解基本正确的,有点不同的是，which是在定语从句中的，主语从句作主语。
备注(1):which为关系代词引导定语从句，which指代a product ,which作定语从句中的主语从句的主语。
备注(2):it is expected为定语从句的主句，it为形式主语，is expected为主句谓语，which would be beneficial for the blind为主句的真正主语。
备注(3):还原后的主语从句为It is expected that a product would be beneficial for the blind。为了方便理解，我把作主语关系代词which换成a product.
备注(4):it is expected为定语从句中嵌入的“主语+谓语动词”，it为形式主语指代后面that主语从句内容，that主语从句的主语，由which充当。
注意以下嵌入式定语从句(关系代词which作宾语从句的主语和主语从句的主语)微小区别
【1】They rolled out a product which it is expected would be beneficial for the blind.
【备注(1)：which指代a product ,which作定语从句中的主语从句的主语。】
【备注(2)：which it is expected would be beneficial for the blind.为定语从句修饰a product】
【备注(3)： it is expected为定语从句主句 ，which would be beneficial for the blind.为定语从句的真正主语(主语从句)】
【2】This is the book which I think is useful for my English study.
【备注(1)：which指代the product ,which作定语从句中的宾语从句的主语。】
【备注(2)：which I think is useful for my English study.为定语从句修饰the book】
【备注(3)：I think为定语从句主句，which is useful for my English study.为定语从句的从句（宾语从句）】
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