一般说来，短语或从句作主语，往往表示的是单数概念，谓语动词应该用单数形式。但是 what 引导的主语从句有时候后面是并列的表语，表示复数概念，谓语动词需要与复数主语保持一致，例如：
What I wanted was (a few days' rest). 我最想要的就是能休息几天。【单数概念】
What I wanted were (a few days' rest and some big meals). 我最想要的就是能休息几天并美美地吃上几顿。【复数概念】
扩展资料：
用it 作形式主语的结构
(1) It is +名词+that从句
It is a fact that … 事实是……
It is an honor that …非常荣幸
It is common knowledge that …是常识
(2) it is +形容词+that从句
It is natural that… 很自然……
It is strange that… 奇怪的是……
(3) it +不及物动词+that从句
It seems that… 似乎……
It happened that… 碰巧……
(4) it is+过去分词+that从句
It is reported that… 据报道……
It has been proved that… 已证实……
一般说来，短语或从句作主语，往往表示的是单数概念，谓语动词应该用单数形式。但是 what 引导的主语从句有时候后面是并列的表语，表示复数概念，谓语动词需要与复数主语保持一致，例如：
What I wanted was (a few days' rest). 我最想要的就是能休息几天。【单数概念】
What I wanted were (a few days' rest and some big meals). 我最想要的就是能休息几天并美美地吃上几顿。【复数概念】