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简单英语语法:be动词

更新时间:2024-01-07 20:46:29作者:梅丽

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[上次审查]

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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