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助动词的实用方法
协助主要动词构成谓语的词叫助动词(Auxiliary Verb)，也叫辅助动词。被协助的动词称作主要动词(Main Verb)。以下是小编整理的关于助动词的实用方法，希望大家认真阅读!
助动词的实用方法 1
1、助动词be
一般疑问句：
陈述句变为一般疑问句时,如句中有be动词(am/is/are/ was/were),可直接将它们提至主语前。
如主语为第一人称,应将其改为第二人称。例如：
Im watching TV.
Are you watching TV?
如主语为第三人称，那么单数用is，复数用are。
例如：
He is good at swimming
Is he good at swimming?
My classmates are kind and polite.
Are your classmates kind and polite?
时态为一般过去时，例如：
He was an engineer.
Was he an engineer?
They were on a long journey.
Were they on a long journey?
特殊疑问句：
特殊疑问句有两种语序：
如疑问词作主语或主语的定语，即对主语或主语的定语提问，其语序是：
“特殊疑问词+陈述句”，例如：
Alice is singing in the room.
Who is singing in the room?
如疑问词作其他成分，即对其他成分提问，其语序是：
“特殊疑问词+一般疑问句”，例如:
He is from Canada.
Is he from Canada?
Where is he from?
2、助动词do
一般疑问句：
陈述句变为一般疑问句时,如句中只有一个实义动词作谓语时，句首加do或does，主语后的实义动词用原形。
例句：
I want to have a haircut.
Do you want to have a haircut?
She like that red car.
Does she like that red car?
时态为一时般过去时，则在句首加did，主语后的.实义动词用原形。
例句：
She came by train.
Did she come by train?
特殊疑问句：
特殊疑问词+一般疑问句，例如:
He plays basketball every night.
Does he play basketball every night?
What does he do every night?
3、助动词have
一般疑问句：
在现在完成时中，陈述句变为一般疑问句则需将has/have提前，放在句首。
例句：
I have finished my homework.
Have you finished your homework?
He has changed his mind.
Has he changed his mind?
特殊疑问句：
特殊疑问词+陈述句，例如：
He has cleaned the room yesterday.
Who has cleaned the room yesterday?
特殊疑问词+一般疑问句，例如：
I have studied English for three years.
Have you studied English for three years?
How long have you studied English?
4、助动词shall和will
注意：Shall只用于第一人称，如用于第二、三人称，就失去助动词的意义，变为情态动词，且有命令意味。
变为一般疑问句，只需将shall和will提前至句首。例如：
We should study harder at English.
Should we study harder at English?
He will go to Shanghai.
Will he go to Shanghai?
变为特殊疑问句，例句：
I shall look after the sheep.
Who shall look after the sheep?
She will go to Beijing tomorrow.
When will she go to Beijing?
5、助动词should和would
should无词义，只是shall的过去形式，只用于第一人称;
would也无词义，是will的过去形式。
用法与shall，will相似，只是shall，will表示一般将来时，should，would表示过去将来时。
注意：这里的shall,will,would,should只作助动词使用，无词义，而非情态动词。
助动词的实用方法 2
助动词一般没有词意，不能单独作谓语动词。其作用在于帮助构成各种时态、语态、否定、疑问等。
1、助动词be(am, is, are, was, were, being, been)的用法
(1) be后跟现在分词构成进行时态。
Who is playing the violin?谁在拉小提琴?
She was reading a book then.那时她正在读书。
(2)be后跟过去分词构成被动语态。
He was asked to do the work.有人要他干这件工作。
You are invited to attend the meetintg.有人邀请你参加会议。
(3)be 后跟不定式作谓语，有如下几种情况：
①表示计划、安排将要发生的事。
Who are we to meet?我们要见谁呀?
Im to have supper with John this afternoon.今天下午我要与约翰一起吃晚饭。
②表示指示、命令，否定式表禁止。
You are to see the headmaster today.今天你必须去见校长。
You are not to enter the room without permission.未经允许你不能进入房间。
③表示义务、责任等，同should。
You are to be back before 5.你得在5点钟以前回来。
What is to be done?该干什么。
④表示可能性，与情态动词may, can同义。
Such books are to be found in any library.这种书任何图书馆都有。
Not a sound was to be heard.一点声响也没有。
⑤表示后来发生的事，可以用来表示命运或注定
They say good-bye, little knowing that they were never to meet
again.他们告别了，没想到再也不能相见了。
He was to regret the decision.他有一天会后悔做出这一决定的。
⑥用于习语
Where am I to go? 我该向何处去?
What am I to do? 我该怎么办?
2、助动词have(has, had, having)的用法
(1)助动词have可以构成完成时或完成进行时
He has been a doctor for 10 years.他当医生十年了。
This is the place I have been longing to visit.这就是我一直渴望参观的地方。
(2)和不定式构成谓语，表示客观上不得不做的事情。
Weve missed the train. Well have to wait for another
one.我们己经误了火车，我们只能等下一列。
-Do we have to start work?我们得立刻工作吗?
-No. We dont have to.不，不必了。
3、do(does, did) 的用法
(1)构成疑问句或否定句
How did you know about it?你是怎样知道这件事的。
He does not smoke. 他不抽烟。
(2)加强语气。
He did tell that.他的`确告诉了此事。
Do come and see us.一定来看我们。
(3)代替前面刚出现的动词，避免重复。
-You like popular music, dont you?你喜欢流行音乐，是吧?
-Yes , I do.是的，我喜欢。
He speaks French as fluently as she does.他讲法语和她讲的一样流利。
(4)用于倒装句中。
Never did he pay attention to my words.他从不注意我的话。
Only then did I understand the importance of English.只是那时，我才了解到英语的重要性。
(5)构成否定的祈使句。
Dont be so careless.不要那么粗心。
Do not hesitate to come for help.只管来求助。
4、shall(should)和will(would) 的用法
(1)shall(should)用于第一人称的将来时中，单纯表示来
I shall think it over.我要好好考虑一下。
When shall I see you again?我何时再见到你?
I rang up to tell her that I should leave for London. 我打电话告诉她我要去伦敦。
(2)will用于第二、第三人称的将来时态中，在现代英语中可以用于所有人称
He will be 30 next month. 他下月将是30岁。
You will have an English test tomorrow.明天你有英语小测验。
He wanted to know when you would finish the writing.他想知道你何时完成写作。
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