be动词在英语中的使用与动词had的区别是不同的，be动词是以表示人称代词的形式出现的，意思是：是在，be动词根据人称的单复数而表现不同的形式，例如：We are students.我们是学生。而had是动词have的过去分词，意思是：有，让，从事。例如：It had been his last desperate hope.这是他仅存的一点渺茫的希望。
1、have，has ，had 作助动词的情况
have，has用于帮助主要动词（实意 动词）构成现在完成时态（单数第三人称用has）had用于帮助构成过去完成时态
例如：
He hasalready finished his homework.他已经完成家庭作业了。
Haveyou ever visited the museum?你原来参观过这家博物馆吗
He hadn't finished his homework before he went to bed.在他睡觉之前，他没有完成家庭作业。
2、 be 动词用作助动词的情况
Be 动词用作助动词主要用于帮助构成各种形式的进行时态和被动语态
一、用于进行时中
协助谓语动词构成时态
现在时：
肯定：am ， is ， are
否定：am not ， isn't ， aren't
过去时：
肯定：was ， were
否定：wasn't ， weren't
将来时：
肯定 ：will be
否定 ：won't be
完成时：
have/has/ had been
haven't/hasn't/hadn't been
用现在进行时：
am/is/are + 动词ing
I am learning English 我在学英语
He is learning English 他在学英语
we are learning English 我们在学英语
过去进行时
was/ were + 动词ing
I was learning English 我在学英语
He was learning English 他在学英语
We were learning English 我们在学英语
将来进行时
will be +动词ing
I will be learning English 我到时会在学英语
He will be learning English 他到时会在学英语
We will be learning English 我们到时会在学英语
其他时态还有：现在完成进行时、过去完成进行时等
含有进行时的时态中，都要有 be动词做助动词
二、用于被动语态中
一般现在时:
am， is， are+ 动词过去分词
English is learnt by me 英语被我学了
English is learned by him 英语被他学了
English is learnt by us. 英语被我们学了
Apple is eaten by me 苹果被我吃了
Apples are eaten by me 苹果被我吃了
一般过去时
was/ were + 动词过去分词
English was learnt by me 英语被我学了
English was learned by him 英语被他学了
English was learnt by us 英语被我们学了
Apple was eaten by me 苹果被我吃了
Apples were eaten by me 苹果被我吃了
一般将来时
will be + 动词过去分词
English will be learnt by me 英语要被我学
English will be learned by him 英语要被他学
Apple will be eaten by me. 苹果要被我吃掉
Apples will be eaten by me. 苹果要被我吃掉
现在完成时
have / has been + 动词过去分词
English has been learnt by me for two years.
英语被我学了两年了
English has been learnt by him for two years英语被他学了两年了
