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語(yǔ)法一致原則是指句子的主語(yǔ)和謂語(yǔ)在語(yǔ)法形式上一致，即通常情況下，謂語(yǔ)動(dòng)詞的單復(fù)數(shù)形式依主語(yǔ)的單復(fù)數(shù)形式而定， 主語(yǔ)為單數(shù)形式時(shí)謂語(yǔ)動(dòng)詞用單數(shù)形式， 主語(yǔ)為復(fù)數(shù)形式時(shí)謂語(yǔ)動(dòng)詞也用復(fù)數(shù)形式。具體內(nèi)容請(qǐng)看下文。

1. 以單數(shù)名詞或代詞、動(dòng)詞不定式短語(yǔ)、動(dòng)名詞短語(yǔ)或從句作主語(yǔ)時(shí)，謂語(yǔ)動(dòng)詞一般用單數(shù)形式;主語(yǔ)為復(fù)數(shù)時(shí)，謂語(yǔ)動(dòng)詞用復(fù)數(shù)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引導(dǎo)的主語(yǔ)從句，后面的謂語(yǔ)動(dòng)詞多數(shù)情況用單數(shù)形式，但若表語(yǔ)是復(fù)數(shù)或what從句是一個(gè)帶有復(fù)數(shù)意義的并列結(jié)構(gòu)時(shí)，主句的謂語(yǔ)動(dòng)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(lái)的合成主語(yǔ)后面，要用復(fù)數(shù)形式的謂語(yǔ)動(dòng)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(gè)詞是指同一個(gè)人或物時(shí)，它后面的謂語(yǔ)動(dòng)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(yǔ)前如果分別有no， each， every more than a (an) ， many a (an)修飾時(shí)，其謂語(yǔ)動(dòng)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(yǔ)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(yǔ)，謂語(yǔ)動(dòng)詞仍用單數(shù)形式;若主語(yǔ)為復(fù)數(shù)，謂語(yǔ)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.

4. either， neither， each， every 或no +單數(shù)名詞和由some， any， no， every構(gòu)成的復(fù)合不定代詞，都作單數(shù)看待。如：Each of us has a new book. / Everything around us is matter.

注意：(1)在口語(yǔ)中當(dāng)either或neither后跟有“of+復(fù)數(shù)名詞(或代詞)”作主語(yǔ)時(shí)，其謂語(yǔ)動(dòng)詞也可用復(fù)數(shù)。如：Neither of the texts is (are) interesting. (2)若none of后面的名詞是不可數(shù)名詞，它的謂語(yǔ)動(dòng)詞就要用單數(shù);若它后面的名詞是復(fù)數(shù)，它的謂語(yǔ)動(dòng)詞用單數(shù)或復(fù)數(shù)都可以。如：None of us has (have) been to America.

5. 在定語(yǔ)從句時(shí)，關(guān)系代詞that， who， which等作主語(yǔ)時(shí)，其謂語(yǔ)動(dòng)詞的數(shù)應(yīng)與句中先行詞的數(shù)一致。如：He is one of my friends who are working hard. / He is the only one of my friends who is working hard.

6. 如果集體名詞指的是整個(gè)集體，它的謂語(yǔ)動(dòng)詞用單數(shù);如果它指集體的成員，其謂語(yǔ)動(dòng)詞就用復(fù)數(shù)形式。這些詞有family， class， crowd， committee， population， audience等。如：Class Four is on the third floor. / Class Four are unable to agree upon a monitor.

注意：people， police， cattle等名詞一般都用作復(fù)數(shù)。如：The police are looking for the lost child.

7. 由“a lot of， lots of， plenty of， the rest of， the majority of + 名詞”構(gòu)成的短語(yǔ)以及由“分?jǐn)?shù)或百分?jǐn)?shù)+名詞”構(gòu)成的短語(yǔ)作主語(yǔ)，其謂語(yǔ)動(dòng)詞的數(shù)要根據(jù)短語(yǔ)中后面名詞的數(shù)而定。如：There are a lot of people in the classroom. / The rest of the lecture is wonderful. / 50% of the students in our class are girls.

注意：a number of“許多”，作定語(yǔ)修飾復(fù)數(shù)名詞，謂語(yǔ)用復(fù)數(shù);the number of“……的數(shù)量”，主語(yǔ)是number，謂語(yǔ)用單數(shù)。

8. 在倒裝句中，謂語(yǔ)動(dòng)詞的數(shù)應(yīng)與其后的主語(yǔ)一致。如：There comes the bus. / On the wall are many pictures. / Such is the result. / Such are the facts.