英语中的be动词可以作为“系动词、助动词”使用，在短语和句型中也十分常见，表“是、成为”之意。be动词随主语的人称、数以及时态的变化而变化。
be动词形式有：am/is/are/was/were/being/been
一、be动词作为助动词
be动词作为助动词，可用于不同时态和语态之中，它随主语的人称、数以及时态的变化而变化。be动词在不同时态中的形式如下：
(1) 一般现在时：am/is/are
She is our Chinese teacher. 她是我们的语文老师。
They are from Chengdu China. 他们来自中国成都。
(2) 一般过去时：was/were
Their parents were already in sixties. 他们的父母已经60多岁了。
(3) 一般将来时：will/shall be
We will be late for the class. 我们上课会迟到的。
(4) 现在进行时：am/is/are v-ing
They are watching TV in the living room now. 他们正在客厅看电视。
(5) 过去进行时：was/were v-ing
He was doing his homework when I called him yesterday night. 昨晚我给他打电话时，他正在写作业。
(6) 将来进行时：will/shall be v-ing
I will be playing the piano between 8 PM and 8:30 PM tomorrow night. 明天上午8点至8点半，我会弹钢琴。
(7) 现在完成时：have/has been
I have been to Shanghai with my parents before. 我和父母以前去过上海。
(8) 过去完成时：had been
I had been in this company since it was created in 2010. 自从这家公司2010年创立以来我就一直在这里工作。
【be动词用于一般现在时用法口诀】
我用am, 你用are, is连着他她它。
单数名词用is, 复数名词全用are。
【be动词用于一般过去时的基本规则】
1.I/he/she/it/单数名词 was…
2.we/you/they/复数名词 were…
(二)、be动词用于被动语态：
(1)一般现在时被动语态：am/is/are PP
Wine is made from grapes. 葡萄酒是由葡萄酿制的。
(2)一般过去时被动语态：was/were PP
The girl was asked some questions by her teacher. 女孩的老师问了她一些问题。
(3)一般将来时被动语态：
shall/will be PP
am/is/are going to be PP
A new airport is going to be built in Chengdu soon. 成都不久之后将修建一座新机场。
(4)现在进行时被动语态：am/is/are being PP
The Autumn Sport Meeting is being held in our school now. 我们学校正在举行秋季运动会。
(5)过去进行时被动语态：was/were being PP
His bedroom was being cleaned at ten yesterday morning. 他的卧室是昨天上午十点钟打扫的。
(6)现在完成时被动语态：have/has been PP
All of his homework has been finished. 他的所有作业都完成了。
(7)过去完成时被动语态：had been PP
The second class had been finished by the time he arrived at school. 当他到大学校时，第二节课已经上完了。
(8)将来完成时被动语态：will/shall have been PP
The new Sports Center will have been finished by October 15th. 新的体育中心将在10月15日前竣工。
二、be动词作系动词
be动词作系动词，后面常跟形容词、名词、副词、介词短语等作表语。系动词和表语组成系表结构作谓语，说明主语的身份、状况以及特征等。
(1) He is tall and strong. 他又高又壮。
(2) She is a middle school student. 她是一名中学生。
(3) His parents are still in bed. 他的父母还在睡觉。
(4) We will be out of food in two days. 两天后，我们就没有食物了。
【be动词使用核心要诀】
*be动词随主语人称和数的变化而变化。
*be动词随句子时态变化而用不同形式。
*be动词是构成被动语态的必备条件。
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