Be 动词就是(am，are，is)句子中如果没有实意动词(例如:write，buy)之类的动词，就直接在主语后面加Be动词。下面小编告诉你英语单词be动词的语法与用法，大家一起来看看吧! 英语单词be动词的语法与用法: 一、be 动词做系动词 1、系动词+表语”的结构 当be 动词做系动词使用时，主要构成“系动词+表语”的结构，在句子中做谓语。表语可以是名词、形容词、副词、介词短语等。例如: The man is a science teacher. Mary's new dresses are colourful. Mother is in the kitchen now. I have been there before. They shall be here at 10:00 tommorow. That can't be true. You are not being very polite. Your brother is being very annoying this evening 2、be 动词的一般疑问句，方法是把be 移到主语前面，也可说成是移到句首。 Is the man a science teacher? Yes, he is. / No, he isn't. Are Mary's new dresses colourful? Yes, they are. / No, they aren't. Was mother in the kitchen then? Yes, she was. / No, she wasn't. Were you at home the day before yesterday? Yes, I was. / No, I wasn't. Was she late this morning? Yes, she was. / No, she wasn't. 3、be 动词用在特殊疑问句 在特殊疑问句里，be 动词仍然移到主语前面，但特殊疑问句是以特殊疑问词开头的，所以be 动词只能说是移到主语前面，或者说是在特殊疑问词的后面。例如: Whose bike is broken? Xiao Ming's bike is. Who was singing in the room? Mr. Zhang was. Where are you from? I am from Wuhu. What class were you in? We were in Class 2. How old is Tom? He is ten. 4、be 动词的否定句 be 动词做谓语时，它的否定形式是在be 后加not，并且可以缩写。例如: It is not sunny today. Tom and his friends are not in the park. You were not nine years old when I went to the university. He was not often late for his class when he was a student. I wasn't here yesterday. My parents weren't at home last Sunday. 5、be 动词的祈使句 be 动词的祈使句有肯定和否定两种形式。肯定形式是以be 动词开头，而否定形式或强调句形，要加don't 或do。例如: Be careful! Be a good boy! Don't be silly! Don't be a fool! Do be obedient! Do be careful.
[图片0] 二、be 动词做助动词 助动词be 有两个基本用法，一是与谓语动词一起构成各种时态，二是构成被动语态。 “be + 现在分词组”成各种进行式时态。例如: Tony's maid is washing his new car. The children are playing in the field. Samuel was eating when I came in. We have been living here since 1959. This time next day they will be sitting in the cinema. 三、注意事项 英语句子中，为了表达时态或被动语态的需要，常常会出现几个助动词连在一块儿使用。也就是说，助动词be会和其它助动词一起使用。这时候，整个句子的一般疑问句和否定句，就不一定是对be 进行变化了，而是以第一个助动词为主进行变化。即哪个助动词在先，就以它为主进行变化。例如: [肯定句] All the wonderful birds can be found in our Bird Park. (助动词有两个:can be ) [疑问句] Can all the wonderful birds be found in our Bird Park? (移第一个can) [否定句] All the wonderful birds can not be found in our Bird Park. (在第一个can 后加not) [肯定句] I have been there before. (两个助动词:have， been ) [疑问句] Have you been there before? [否定句] I have not been there before. [肯定句] I shall be having my supper at six tomorrow evening. (两个助动词:shall， be ) [疑问句] Will you be having my supper at six tomorrow evening? [否定句] I shall not be having my supper at six tomorrow evening. there be结构的分析与理解: ■there be结构在英语里是一种常见的特殊句子结构。它以引词there(由副词there变来)开首，后常接动词be的各种形式，再后才是主语，主语之后又常有表地点和时间的状语。它像是一种倒装句，但又非倒装句，因为这种“倒装”已成为一种自然的词序。这种结构中的there本身无词义，其后的动词be具有“存在”之意，所以是一实义动词。 ■基本用例: There is a garden behind the house. 房子后面有一座花园。 There is nothing but clothing in this cupboard. 这个柜子里只有衣服。 There is a telephone box on the comer. 在拐弯处有一个电话间。 If there is any problem, let me know. 如果有什么问题可以通知我。 There is only one person I could approach. 只有一个人我可以去找。 There is little difference between the two words. 这两个字没有什么差别。 注意下面一句: There was a dog there. 那里有一条狗。 There is a bus-stop just there. 那里就有公共汽车站。 句中第一个there是引词，无词义;第二个there是副词，有词义。
[图片1] ■there be结构表“存在”，have表“所有”，试比较: There are several oak trees in the garden. 花园里有好几株橡树。(主语是oak trees) They have several oak trees in the garden. 他们在花园里种有好几株橡树。(主语是they) There’s a telephone in every room. 每一个房间都有一部电话。(强调客观存在) Every room has a telephone. 每一个房间有电话。(强调电话是每个房间的一固有部分) ■句首的there如重读，则非引词，而是副词，试比较: There is the book 1 want. 那儿就是我所要的书。(there是副词，有词义) There are some books 1 want. 有一些我所要的书。(there是引词，无词义) ■在there be结构中，be之后加上not或no, 即变成否定句，如: There is no great difficulty. 没有大的困难。 There is no need to worry. 没有必要发愁。 There is not much doubt about his guilt. 对他的罪行没有多少怀疑。 There is not much life in a small country village. 一座小村庄没有多少生气。 ■变为疑问句时，须把be移至there之前，如: Are there any children in the room? 房间里有小孩吗? Are there any boys in your group? 你们小组中有男生吗? Is there anything for me to do? 有什么事需要我做? Is there a doctor available? 能请到医生吗? ■there be结构中的动词be与主语的数必须一致，但主语如是一系列事物，第一个事物为单形可数名词，谓语动词则可用单数形式，如: There is a textbook, a dictionary and some notebooks on the desk. 桌上有一本教科书、一本字典和几本笔记。 有时说话人先说出了there is(was)，然后才想到要用复形名词，如: There’s some things I can’t resist. 有些事物我是不抗拒的。 There’s hundreds of people on the waiting list. 登记排队的人有好几百。 there be句式时态问题: ■一般现在时 There is still room for improvement. 还有改进余地。 There is nothing to be done now. 现在没有办法了。 There is (some) milk in the fridge. 冰箱里有一些牛奶。 If there is any problem, let me know. 如果有什么问题可以通知我。 ■一般将来时 There’s going to be trouble. 要出事了。 There will be rain next week. 下星期要下雨。 There will be bloodshed tonight. 今晚会发生流血事件。 There is going to be [will be] an English film tonight. 今晚将有一场英语电影。 There will follow an interval of five minutes. 接着将有五分钟的休息时间。 There will be a perfectly logical explanation for all those deaths. 对所有那些死因都将会有一个完全合乎逻辑的解释。 ■一般过去时 There was a lot to be done. 有很多事要做。 There wasn’t any change in him. 他没有什么变化。 There was a third reason for haste. 匆忙行事还有第三个理由。 There was nothing to fear from that quarter. 那方面没有什么可怕的。 There were some children swimming in the river. 有些小孩在河里游泳。 There were lots of complaints about the boys, but none about the smoke. 对这些男孩有许多抱怨，但没有关于抽烟的抱怨。 ■现在完成时 There have been a lot of inquiries. 提出的询问有很多。 There have been a lot of enquiries. 进行过许多调查。 There have been many such accidents. 已发生了好几起那样的事故。 There have been several break-ins this year. 今年发生了好几起强行入室盗窃事件。 There has been an increase in the number of road incidents recently. 最近交通事故的数目有增加。 There have a lot of bad luck lately. 最近发生了一些变化。 There has been little business between the two companies. 这两家公司之间几乎没有什么业务往来。 ■过去完成时 There had been many such occasions. 曾有许多这种情况。 There had been two sea fights between them. 他们之间发生了两场海战。 There had been two sea fights between them. 他们之间发生了两场海战。 ■过去将来时 There would be endless rows if I was at home. 如果我在家会有吵不完的架。 Then there would be a plebiscite. 那么就会举行公民投票。 Tom didn’t say that there would be a demonstration. 汤姆没说要举行示威游行。 There would never again be a love such as she had felt for Alex. 永远也不人再有她对爱丽克斯所拥有的那种爱了。 there be的非限定形式: there be的非限定形式是there to be和there being，主要用来做介词或动词的宾语、主语或状语。如: Have you ever thought of there being so many interesting films for you to choose from?没想到过有这么多有趣的电影供你选择吧? John was relying on there being another opportunity. 约翰相信另有机会。 There being a bus stop so near my house is a great advantage. 有公交车停在离我房子这么近的地方是很大的优势。 There having been no rain, the ground was dry. 由于没有下雨，地上很干燥。 It’s unusual for there to be so few people in the street. (=It’s unusual that there are so few people in the street) 这条街上这么少的人是不寻常的。 It was too late for there to be any subways. 太晚了，不会有地铁了。 Would you like there to be a meeting to discuss the problem? 你们要开个会讨论一下这个问题吗? I don’t want there to be a simple mistake in the article that I have written. 我不想我写的这篇文章中有错误。 I except there to be no argument about this. 我期限望对此事没有争论的。 注:there to be常做like, expect, mean, want, intend, prefer, hate等的复合宾语。