主谓一致的基本原则
主谓一致有以下三条原则
1)语法一致原则,即在语法形式上取得一致。例如,主语是单数形式,谓语动词也采取单数形式;主语是复数形式,谓语动词也采取复数形式.
例如:The students are very young.This picture looks beautiful.
2)意义一致原则,即从意义着眼处理一致关系。例如,主语形式虽是单数但意义是复数,谓语动词也采取复数形式;而有些主语形式虽是复数但意义上看作单数,谓语动词也采取单数形式。
1.The people in that country are fighting for independence.
2.The crowd deeply respect their leader. 
weight什么时候用复数3。Three years in a strange land seems a long time.
3)就近原则,即谓语动词的单数或复数形式取决于最靠近它的词语。例如:
Neither he nor I am going to see the film tonight because we are busy.
Either .。or    …
2.主谓一致的用法
根据以上三条原则,主谓一致有如下用法:
1)下列结构作主语,谓语动词一般用单数形式
a.表示时间、重量、长度、价值的名词作主语,谓语动词通常用单数形式。例如:
1。Two hundred miles is a long distance.
2。Ten dollars is a high price for that book.
b.由anyone,anything,anybody,no one,nothing,everyone,everybody,everything,someone,somebody,each,either,neither等不定代词作主语,谓语动词使用单数形式。例如:
1.Someone is knocking at the door.
2。Anything is better than going to the movie tonight.
c.由“a series ofa kind of,a portion of +名词”作主语,谓语动词应用单数形式.例如:
A series of debates is scheduled to be held next week.
d.由“many amore than one +单数名词”作主语,尽管意义上表示复数,但谓语动词仍采用单数形式。例如:
Many a person in these circumstances has hoped for a long break.
There is more than one answer to your question.
e.“名词+and+名词”作主语,表示同一人、同一概念或事物时,谓语动词用单数形式。例如:
A writer and educator is giving a lecture now.(这个人既是作家又是教育家)

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