2019-10-18 13:21:26
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无论是剑桥少儿英语还是剑桥五级英语，同学们在助动词表达的时候有时态和语态两种方式，助动词具有语法意义，但没有词汇意义，不可单独作谓语等等，今天小编就为大家详细做一些分析，希望能够帮助大家更好的应对这门考试，下面就和小编一起看看吧。
do用作助动词的三种用法：
一、用于构成疑问句、否定句或倒装句
1. 构成疑问句
Where do I pay? 我在哪儿付钱?
When do you start? 你何时动身?
How did you do it? 你是怎么做的?
How do you feel today? 你今天感觉如何?
Why do you keep on smiling? 你怎么老是笑?
How does the story end up? 这故事结局如何?
How does she stay so young? 她怎么能永葆青春呢?
When did you realise that the money was missing? 你什么时候发觉钱丢了?
2. 构成否定句
I don’t like football. 我不喜欢足球。
Please don’t annoy me. 请不要打搅我。
I didn’t arrive at the station early enough. 我到达车站不够早。
I don’t care how expensive it is. 我不在乎这件东西有多贵。
I didn’t meet either Jane or her husband. 简或是她的丈夫我都没遇见。
He washed the car. He didn’t polish it. 他冲洗了汽车。他没有擦拭它。
3. 构成倒装句
Never did he speak about his own merits. 他从不讲自己的功绩。
Very rarely did she receive letters from her brother. 她很少收到她兄弟的信。
Hardly had he arrived when she started complaining. 他一到家，她就抱怨起来。
Never did he think the book would be finished so soon. 他可没想到这本书会这么快看完。
Seldom has a devoted teacher been so splendidly rewarded. 一位忠诚的教师很少受到如此丰厚的报答。
二、加在动词前，表示强调
She does like dogs. 她真的喜欢狗。
Do have another cup of coffee. 请再喝杯咖啡吧。
Do be careful with that vase! 务必小心那个花瓶!
I do hope you’ll get better soon. 我真希望你早日康复。
He did come but soon went back. 他是来了，但很快就回去了。
三、用来表示刚提到的动作，以避免重复
“She likes cakes.” “She really does.”“她喜欢吃蛋糕。”“她的确喜欢。”
Watch that man—I want to know everything he does. 盯住那个人——我要了解他的一切活动。
I always eat peas with honey. My wife never does. 我总是就着蜂蜜吃豌豆。我的妻子从来不这样吃。
She paid them a generous wage for the little they did. 她为他们的那么一点工作付了很高的工资。
Some parents did it only once a week, some said they never did. 一些父母每周仅做一次，一些父母则说他们从来不做。
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。
以上就是小编为大家带来的关于剑桥五级英语考试备考介绍，同学们一定要多加关注，更好的去做选择。想要获取更多pet3报名等更多信息，大家可以线上咨询客服哦！最后小编预祝大家能考取心中满意成绩。
