1.语法一致的原则
(1)以单数名词或代词,动词不定式短语作主语时,谓语动词要用单数;主语为复数时,谓语用复数,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连接的并列成分作主语时,谓语动词用复数。例如:
Both he and I are right.
Mr Black and Mrs Black have a son called Tom.
但并列主语如果指的是同一人,同一事物或同一概念,谓语动词用单数。例如:
His teacher and friend is a beautiful girl.
The poet and writer has come.
(3)由and连接的并列单数主语之前如果分别由each, every修饰时,其谓语动词要用单数形式。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)主语是单数时,尽管后面跟有 but ,except, besides, with 等介词短语,谓语动词仍用单数。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.
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