在英語句子里，謂語受主語支配，其動詞必須和主語在人稱和數(shù)上保持一致，這就叫主謂一致。尋其規(guī)律，大致可歸納為三個原則，即語法一致、邏輯意義一致和就近一致原則。

一、語法一致原則

語法上一致就是謂語動詞和主語在單、復(fù)數(shù)形式上保持一致。

1. 以單數(shù)名詞或代詞、動詞不定式短語、動名詞短語或從句作主語時，謂語動詞一般用單數(shù)形式；主語為復(fù)數(shù)時，謂語動詞用復(fù)數(shù)形式。如：His 高中語文 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引導(dǎo)的主語從句，后面的謂語動詞多數(shù)情況用單數(shù)形式，但若表語是復(fù)數(shù)或what從句是一個帶有復(fù)數(shù)意義的并列結(jié)構(gòu)時，主句的謂語動詞用復(fù)數(shù)形式。如：What I bought were three English books. / What I say and do is （are） helpful to you.

2. 由連接詞and或both …… and連接起來的合成主語后面，要用復(fù)數(shù)形式的謂語動詞。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所連接的兩個詞是指同一個人或物時，它后面的謂語動詞就應(yīng)用單數(shù)形式。如：The writer and artist has come. （2）由and連接的并列單數(shù)主語前如果分別有no， each， every more than a （an） ， many a （an）修飾時，其謂語動詞要用單數(shù)形式。如：Every student and every teacher was in the room. / No boy and no girl likes it.

3. 主語為單數(shù)名詞或代詞，盡管后面跟有with， together with， except， but， like， as well as， rather than， more than， no less than， besides， including等引起的短語，謂語動詞仍用單數(shù)形式；若主語為復(fù)數(shù)，謂語用復(fù)數(shù)形式。如：Mr. Green， together with his wife and children， has come to China. / Nobody but Jim and Mike was on the playground. / She， like you and Tom， is very tall.
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