1. 語法一致的原則
�。�1）以單數(shù)名詞或代詞，動詞不定式短語作主語時，謂語動詞要用單數(shù);主語為復(fù)數(shù)時，謂語用復(fù)數(shù)，例如：
He goes to school early every morning.
The children are playing outside.
To work hard is necessary for a student.
�。�2）由and或both……and連接的并列成分作主語時，謂語動詞用復(fù)數(shù)。例如：
Both he and I are right.
Mr Black and Mrs Black have a son called Tom.
但并列主語如果指的是同一人，同一事物或同一概念，謂語動詞用單數(shù)。例如：
His teacher and friend is a beautiful girl.
The poet and writer has come.
�。�3）由and連接的并列單數(shù)主語之前如果分別由each, every修飾時，其謂語動詞要用單數(shù)形式。例如：
In our country every boy and every girl has the right to receive education.
Each man and each woman is asked to help.
�。�4）主語是單數(shù)時，盡管后面跟有 but ,except, besides, with 等介詞短語，謂語動詞仍用單數(shù)。例如：
The teacher with his students is going to visit the museum.
Nobody but two boys was late for class.
Bread and butter is a daily food in the west.
（5） 一些只有復(fù)數(shù)形式的名詞，如people, police, cattle, clothes等作主語時，謂語動詞要用復(fù)數(shù)。例如：
A lot of people are dancing outside.
The police are looking for lost boy.
�。�6）由each, some, any, no, every 構(gòu)成的復(fù)合代詞作主語時，謂語動詞都用單數(shù)。例如：
Is everybody ready?
Somebody is using the phone.
�。�7）有兩部分構(gòu)成的物體的名詞，如glasses, shoes, trousers, chopsticks, scissors 等作主語時，謂語動詞用復(fù)數(shù)。例如：
Where are my shoes? I can’t find them.
Your trousers are dirty. You’d better change them.
如果這類名詞前用了a pair of等，則往往用作單數(shù)，謂語動詞的單復(fù)數(shù)形式往往取決于pair的單復(fù)數(shù)形式。例如：
Here are some new pairs of shoes.
My new pair of socks is on the bed.
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