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英语语法初探:连接动词
[本期内容]
一、内容概述
二、内容简述
(1)定义
英语中be动词的用法主要有两种:一种是用作系动词,另一种是用作助动词。
be动词的形式会随着主语单复数的变化而变化,也有各种时态的变化,主要有:
General formula: am, is, are, such as "he is a student." Or "I'm from France." .
Past tense: was, were, such as "she was in the office at that time." .
There exists, such as "My father is repairing it." .
Perfect: Yes, for example, "They have been there twice." .
系词动词be
be动词作系词时,主要用来表示主语的状态,所以也叫状态系词。它后面常跟一个名词、形容词或短语,作谓项构成系统表结构,充当句子的谓语。比如:
She is very happy today.
He has been a teacher for ten years.
We were at the party last night.
助动词be
be动词作助动词时,主要用于构成各种进行式和被动式,如:
He is reading a novel now.
They will be sent to prison next week.
(4)其他用途
Be动词有时可以用来引导祈使句,如:
Be quiet!
Be a man!
Don't be silly!
[注意]
此时,助动词do有时可以加在句首以示强调,如:
Do be careful!
小心点!
(5)be的缩写
Be动词只有一般表达式的缩写形式,即:am-'m,is-'s,are-'re。比如:
I'm not a nurse.
He's in bed now.
They're from Canada.
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