柠檬脾气个人GMAT语法笔记,综合Manhattan SC及 prep语法笔记
8.从句做主语，单数
1). what引导的名词性从句中从句谓语动词的单复数情况：
what后面“什么时候用单数,什么时候用复数”根据动词后面的名词的单复数来定.
2).what (who/why/how/whether) 引导的名词性从句做主语时,主句谓语动词用单数一定是正确的：
********有时也参照下面的单复数规则：
(1)What在从句中做主语，主句谓语由what从句的谓语决定。
1) What is difficult to understand is A.；What are difficult to understand are A and B.
(2)what在从句中做宾语，主句谓语由主句表语/宾语决定what they want are XX,XX&XX。
2) What his father left him are a few English books.
平行结构 一. 原则：结构相似，词性相同，形式对称，概念对等，功能相同，意思单一
（主被动语态需要相同么？） 二. 平行标志词：
连词：And, or, but, yet （but只能连接两个并列成分）
短语：both and, either or; neither nor, not but, not only.. but also (not only…also… not
onl..but…), rather than, from..to..; between..and..; as well as (not…but… > rather
than > instead of) 一般出现instead of 错
三. 重要考点：
