be动词本身就是不及物的，它不能接宾语，而只能接表语。正如你提供的词典解释：用来表示某物属于谁或它是为谁准备的，我的，你的等等。

be动词有以下3种称呼和3种用法

(1)助动词be，所谓助动词，就是起帮助/协助作用，帮助句子完成某种语法功能，帮助句子变成各种进行体，帮助句子变成被动语态。

A:助动词be+现在分词(doing)构成进行时态（进行体）

This is happening in every school throughout the country. 

全国各地每所学校都在发生这样的事情。

She didn't always think carefully about what she was doing. 

她对自己在做的事情并不总是考虑得很清楚。

B:助动词be+过去分词(done/V-ed)构成被动语态

Forensic experts were called in. 

法医专家被请来。

Her husband was killed in a car crash..

她的丈夫死于车祸。

(2)系动词be，系动词be用法主要把主语和表语联系在一起对主语加以说明，说明主语，身份，特点，性质，状态以及内容等

A:系动词+表语（表语可以是：名词，代词，数词，副词，介词短语，分词形容词，不定式，动名词，从句）

His father is a famous scientist.

Tom's grandfather is one hundred and five.

She is not quite herself .

All the students are in the classroom.

We are all here.

The story is touching

We are so excited

Her wish is to become an actress.

Her job is washing dishes

His dream is that he wants to be a pilot.

(3)不及物动词be：be作为不及物动词，表示存在。相当于exist

be vi.存在 (英文解释：If something is, it exists.）

It hurt so badly he wished to cease to be.  

他觉得疼痛难忍，恨不得死了算了。

to be or not to be.  

活着还是死去