语法复习二、主谓一致

在英语句子里，谓语受主语支配，其动词必须和主语在人称和数上保持一致，这就叫主谓一致。寻其规律，大致可归纳为三个原则，即语法一致、逻辑意义一致和就近一致原则。
 （一）语法一致原则：语法上一致就是谓语动词和主语在单、复数形式上保持一致。
 1、以单数名词或代词、动词不定式短语、动名词短语或从句作主语时，谓语动词一般用单数形式；主语为复数时，谓语动词用复数形式。如：his father is working on the farm. / to study english well is not easy. / what he said is very important for us all. / the children were in the classroom two hours ago. / reading in the sun is bad for your eyes.
 注意：由what引导的主语从句，后面的谓语动词多数情况用单数形式，但若表语是复数或what从句是一个带有复数意义的并列结构时，主句的谓语动词用复数形式。如：what i bought were three english books. / what i say and do is (are) helpful to you.
 2、由连接词and或both … and连接起来的合成主语后面，要用复数形式的谓语动词。如：lucy and lily are twins. / she and i are classmates. / the boy and the girl were surprised when they heard the news. / both she and he are young pioneers.
 注意：① 若and所连接的两个词是指