英语中，be动词和实义动词经常出现。对于七年级学生而言，总是难以确定该用动词的什么形式呢?下面小编告诉你
七年级英语be动词用法，大家一起来看看吧!
七年级英语be动词用法：
be动词，和实义动词一样，都是动词。
在英语中，也遵循“”一山不能容二虎“”的原则，句子中一般不会出现两个动词。
举例：I am sing.不对
第一种：be +doing
表示：正在做、正在进行，并且主语与实义动词这个动作之间是主动关系。
如：I am singing.
The population of the world is still increasing.
第二种：be+done
表示：被做，主语与实义动词这个动作之间是被动关系。
例：He is laughed at by his classmates.
第三种：be+to do
表示：将做、要做，表示目的
例：The purpose of the test is to show what you have learned.
两种不同性质的“be +不定式”结构：
在不同的语境中，“be+动词不定式”结构可以表示多种不同的语义。
一、表示“计划”或“安排”。
This line is to be opened to traffic next week. 该线路将在下周通车。
They are to meet at the gate of the school. 他们将在学校门口见面。
二、表示“命令”。一般译为“必须”或“不准”。
No one is to leave the room without permission.
This naughty boy is to stay here until class is over.
三、表示“可能性”。
Are you to pay the debt for your wife?
The lovely puppy is nowhere to be found.
四、表示“意图”或“打算”。一般译为“想要”。
If you are to be there on time, you had better hurry.
If all of us are to remain friendly, we must be sincere with one another.
五、表示“应该”。
You have done so well. You are to be rewarded.
Such nasty questions are to be avoided.
六、表示“不可避免”或“注定发生”，意为“必定”。例如：
Your plan is to be a failure.
The murderer was sentenced to life imprisonment and was never to see his family again.
She did not think too much of her unkind acts. However, they were to be harmful to herself, too.
Tom wasn't worried about his head injury, but it was to be troublesome for him later.
七、表示“期待”。
The actual use of the newly invented equipment is still to be determined.
Henry's appointment with the firm is yet to be confirmed.
get与be的纠葛：
英语中，“be+过去分词”和“get+过去分词”都表示被动语态，但它们是有区别的。请比较：
The vase was broken by the maid, but the master wanted to know how it got broken. 花瓶被女仆人打破了，但主人想知道它是怎样被打破的。
通过分析对比，我们发现：was broken 表示“一种既成的结果”，说明花瓶被人打破了;got broken则强调“一种过程或动作”，说明它是怎么被打破的。
刚才问的那个句子也属于这种情况。又如：
The children were lost in the forest. I wonder how they got lost. 孩子们在森林里迷了路。我不知道他们是怎么迷路的。
除此以外，“get +过去分词”和“be +过去分词”还有一些其他的区别。
1.“get+过去分词”往往强调一种突发或偶发事件，多为不愿看到的事情。例如：
He got injured by a car when he was crossing the road. 过马路时他被车撞伤了。
The picture got damaged when we were moving. 我们搬家时，这幅画受了损。
The miners got trapped in the deep mine last Tuesday. 上周二矿工们被困在深井中。
2.“get+过去分词”在表示强调、否定和疑问时，需借助助动词do或did，而“be +过去分词”则不需要。例如：
They did get caught in the rain last night. 他们昨天晚上确实被雨淋着了。
Tom didn’t get beaten yesterday evening. 汤姆昨天晚上没有挨打。
Did your letter get answered? 你收到回信了吗?
3.“get+过去分词”可以有进行时态，表示一种“渐变过程”;而“be+过去分词”则没有。例如：
The students are getting prepared for the sports meeting. 学生们正在为运动会做准备。
She was getting worried about her exams. 她当时正在为考试发愁呢。
You will be getting puzzled if you don’t know the truth. 如果你不了解实情，你会变得迷惑不解。
除了上述的区别外，“get +过去分词”还常用于以下几种情况：
1. 强调进入或者变为某种不利状态。例如：
We don’t want any of you to get lost in the crowd. 我们不想你们任何人在人群中迷路。
He went out and got drunk. 他出去喝醉了酒。
The secret got known at 10 o’clock. 秘密在十点钟就被人们知道了。
2. 常用于日常生活起居，过去分词具有反身意义(相当于“主动语态+oneself”)。例如：
He could not wash himself or get dressed. 他既不会洗刷，也不会穿衣。(=dress himself)
She got washed after she came back home from work. 她下班回到家后洗了澡。(=washed herself)
They began to watch TV as soon as they got seated. 他们一坐下就看电视。(=seated themselves)
3. 强调由一种状态渐渐变为另一种状态，如习惯、好恶等。例如：
She soon got tired of learning English. 很快她就对学英语厌倦了。
You will soon get used to this kind of work.你很快就会习惯这种工作。
4. 强调引起心理和情感上的变化。例如：
She got very pleased with her new room. 她对她的新房间颇为满意。
I got surprised at the news. 这消息使我吃惊。
there be 句式的语法要点：
一、概说
英语中的there be结构主要表示某处存在有某物，所以通常被称为存在句。其中的there为引导词，无词义，be为谓语动词，there be后面的名词为句子主语。
二、there be结构的主谓一致问题
在there be句型中，若句子只有一个主语，谓语的数则取决于该主语的数;若有几个主语并列，则通常是与靠近的主语保持一致。如：
There is no cause for anxiety. 不必焦虑。
There is some dirt on your coat. 你的外套上有灰尘。
There are twenty children present. 在座的有20个孩子。
There is a teacher and some students over there. 那边有一位老师和一些学生。
三、there be结构的时态问题
there be结构的时态由其中的谓语动词be来体现，它可以有一般现在时、一般将来时、一般过去时、现在完成时以及过去完成时等多种时态形式。如：
There will be a rise in unemployment next year. 明年失业人数将会增加。
There have been a series of car accidents at the crossing. 在这个交叉路口已发生了一连串的车祸。
There had been two sea fights between them. 他们之间发生了两场海战。
四、there be结构与情态动词连用
there be结构有时可以与情态动词连用。如：
There may be an opportunity for you to see the premier. 你可能有机会见到总理。
There must be something wrong with my left arm, which is asleep.我的左臂发麻，一定出什么问题了。
There used to be a lot of troubles in that region. 那个地区过去动乱不断。
五、there be结构的非谓语形式
there be结构的非谓语形式有两种基本结构，即there being和there to be。一般说来，there being结构主要用作状语或介词宾语;There to be 结构主要用作动词宾语。如：
There being no further business, I declared the meeting closed. 没有更进一步的情况(讨论)，我就宣布闭会。
There is now some hope of there being a settlement of the dispute. 现在有点希望可以解决这次争端。
We expect there to be more discussion about this. 我们期望能对此展开更多的讨论。
注：用作介词宾语一般用there being，但用作介词for的宾语时，只能用there to be。比较：
They planned on there being another meeting. 他们打算再开一次会议。
They planned for there to be another meeting. 他们打算再开一次会议。
