英语语法知识求救What the children in the mountain village need ____ good books.A,is B,are 谓语动词为什么要用复数?根据谁判断这是什么语法知识?同例 What I need is money

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英语语法知识求救What the children in the mountain village need ____ good books.A,is B,are 谓语动词为什么要用复数?根据谁判断这是什么语法知识?同例 What I need is money
英语语法知识求救
What the children in the mountain village need ____ good books.
A,is B,are
谓语动词为什么要用复数?根据谁判断
这是什么语法知识?
同例 What I need is money

英语语法知识求救What the children in the mountain village need ____ good books.A,is B,are 谓语动词为什么要用复数?根据谁判断这是什么语法知识?同例 What I need is money
告诉你一条其它回答者都没提到的一个关键点：这种”主-系-表“结构中”用名词/代词“作表语的句型,其实是可以倒过来说的.
也就是说,山村里的孩子所需要的是好书＝好书是山村里孩子所需要的.
由于你说的句子用what引导的”名词性从句“（主语从句）作的主语,从句作主语的时候,其数量是不好确定的,只能通过后面的成份（如数量词或名词中心词）来确定,从books可见必须是复数,于是选B,这就是分析推理过程,而不是死套语法规则（其实很多规则也是这么推理出来的）.
需要说明的是,主语从句本身的主语是children,其谓语是need,其宾语是what,整个从句一起作后面的主语.

what the children in the mountain village 是need的定语
need为主语，不可数，所以谓语取决于宾语books
books为复数所以谓语用are
同理what I need is money. Money不可数，所以用is

朋友，这是个主语从句，根据句意，山里的孩子们最需要的就是好书。这么多的孩子不可能用一本书，就此判断，谓语用复数。考的是主谓一致。
第二个我所需要的就是钱，因为钱为不可数名词，所以谓语用单数。

根据后面的books判断，考察的是主谓一致

在主谓一致语法点当中,以 what 引导的主语从句,后面接系动词 be, 再接名词作表语, be 动词的数由表语确定,如果表语是单数,则 be 动词用单数,如 What I need is money. 如果表语是复数,则 be 动词用复数,如 What the children need are good books.

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