助动词用来构成时态和语态。 助动词具有语法意义，但没有词汇意义，不可单独作谓语。它没有对应的汉译，下面小编告诉你*英语*助动词用法，大家一起来看看吧!
*英语*助动词用法：
只有实意动词作谓语时才涉及使用助动词。以like为例：
1)当句子为肯定句时不涉及使用助动词，只涉及"主谓一致"原则。
eg : I like English a lot.
Michael likes Chinese food very much.
2)当句子为否定句时，要根据主语的人称来决定使用相应的助动词：当主语为"三单"时，要使用does;当主语为"非三单"时，用助动词原形do。例如把下列句子变否定句：
Kangkang likes math.----Kangkang doesn't like math.
They like sports.------They don't like sports.
3)当句子变疑问句时，同样要根据句子的主语来决定在句首使用Do或Does.例如下列句子变问句：
Michael likes Chinese Food.----Does Michael like Chinese food? Yes, he does./ No, he doesn't.
Jane and Helen like music.----Do Jand and Helen like music? Yes, they do./ No, they don't.
用作情态动词和助动词的will：
一、用作助动词
will 用作助动词，表示将来，用于构成将来时态。如：
She will be back in a minute. 她一会儿就回来。
I’ll carry your case for you. 让我来给你提手提箱。
二、用作情态动词
1. 表示意愿，其意为“愿意”“想要”。如：
Will you accept a cheque? 你收支票吗?
2. 表示请求，意为“请……”“……好不好”。如：
Be quiet for a moment, will you? 你安静一会儿，好吗?
3. 表示可能性，意为“可能”“该是”“很可能”。如：
The car will hold six people. 这车应该可坐6个人。
That will be the postman at the door now! 现在门口准是邮递员来了!
4. 表示命令，意为“要”“得”。如：
You will carry out these instructions and report back this afternoon. 你要执行这些指示并于今日下午报告执行情况。
5. 表示习惯或倾向性，意为“总是”“惯于”。如：
Oil will float on water. 油总是浮在水面上。
This window won’t open. 这扇窗户经常打不开(老是打不开)。
She will get angry over nothing. 她老是无缘无故地发脾发。
助动词have的用法：
1. have +过去分词，构成完成时态。如：
He has left for Japan. 他已去了日本。
We’ve just done the washing-up. 我们刚洗完碗碟。
Poor Jim has just had an accident. 可怜的吉姆刚出了个事故。
I have had this car for three years. 这辆汽车我已用了3年了。
By the end of last month, they had finished the work. 上月未他们就已经完成了工作。
2. have + been +现在分词，构成完成进行时。如：
I have been studying English for 8 years. 我学英语已达八年了。
The children have been having a lot of run. 孩子们一直玩得很开心。
We had been doing business with each other for years before we quarreled. 在吵翻之前，我们多年来在业务上一直来往。
By this time next year, we will have been doing business with each other for 20 years. 到明年这时候，我们的业务住来就满20年了。
I woke up—I had been having a bad dream. 我醒了，我做了个噩梦。
3. have+been +过去分词，构成完成式被动语态。如：
English has been taught in China for many years. *教英语已经多年。
I have been made redundant, so I’m going abroad. 我被定成了超编人员，所以我打算出国。
Thousands of pounds have been spent on the new hospital. 这家新医院花费了数千英镑。
None of my friends have been invited to the party. 我的朋友中没有一个被邀参加晚会。
All means have been used to get him to change his mind. 为了转变他的想法，所有的办法都用过了。
助动词be的用法：
1. be +现在分词，构成进行时态。如：
They are having a meeting. 他们正在开会。
We were planting trees this time yesterday. 我们昨天这个时候在植树。
2. be + 过去分词，构成被动语态。如：
The door was broken by Tom. 门是汤姆打破的。
English is taught in our school. 我校教英语。
3. be + 动词不定式，可表示：
A. 打算、决定、计划、安排等。如：
He is to visit Japan next week. 他决定下周访问日本。
I was to have told you yesterday, but you were not in. 我本打算昨天告诉你的，但你不在家。
B. 指示、命令、禁止等，即“必须，一定”。如：
You are to hand in the exercises tomorrow. 你们明天必须交练习。
You’re not to (=You mustn’t) smoke here. 你不可以在此处抽烟。
C. 责任、义务、需要，即“该不该”。如：
You are to (=should) report to the police. 你应该报警的。
Am I to go on with the work? 这工作我该不该继续干下去?
D. 可能性，与can, may相当，不定式多用被动式。如：
The book was not to (=could not) be found. 那本书可能找不到了。
E. 假设，用于虚拟条件句中。如：
If it were to rain, we would get wet. 要是下雨，我们就会淋湿。
F. 表示注定要发生或后来必然发生。如：
This experience was to change his life. 这次经历注定要改变他的生活。
注：不定式作表语与上述用法是不同的。如：
My idea is to go there today. 我的意思是今天就去那里。
