考博英語培訓班推薦

考博英語重點語法：主謂一致關系
　　2.如果主語是一個抽象概念(如不定式、動名詞、主語從句等)謂語動詞用單數形式。如果主語是用and連接的兩個或多個抽象概念，謂語動詞用復數形式。
　　如：Swimming jogging and cycling are all goad farms of sports exercises.游泳、慢跑和騎自行車都是很好的運動形式。
　　To live to eat is not a very goad attitude toward life. 活著就是為了吃不是好的生活態(tài)度。
　　To live to eat and to eat to live are very different attitudes toward  life.
　　以what，who，why，haw, whether等wh一詞引起的從句做主語時，謂語動詞通常用單數;由and連接的兩個主句如果指兩件事，動詞用復數。
　　例如:What he is doing is not clear yet他在干什么還不清楚
　　What he is doing and whether I know him are two different things.他在干什么和我是否認識他是兩件不同的事。
　　What she told me is none of your business. 她和我說的什么用不著你管。
　　What she told me and what she told you are totally different things.
　　以what從句為主語的“主一系一表SVC"句型中，如果主句的表語是復數，主句謂語動詞用復數形式;what從句本身是復數意義，主句謂語動詞也可用復數。
　　如：What I need buy now are four tea cups and a pair of sports shoes.
　　我需要買的是四只茶杯和一雙運動鞋。