am,is,are,can,how等助动词怎么使用

问题描述:

am,is,are,can,how等助动词怎么使用

在英语语法中am is are是Be动词;can,must,may,need,will等是情态动词,其中will和need也可作实意义动词;how是连词,也可作副词.
Be动词的一般含义为:是,在,成为,变化形式有was,were,been,being,而且每个形式针对一种人称,I am/was he/she is/was they are/were you are/were
例如:
He is a teacher.他是一位教师.
The girl is crying.女孩在哭.
I want to be a scientist.我想成为科学家.
情态动词是动词的一种,但是不能独立充当谓语,必须与动词原形连在一起使用,其含义can能,may也许,need需要,will将,must必须(其中need也可作名词表示需要、需要的东西)
例如:
He can swim.他会游泳(can和swim共同构成谓语)
I will go to park tomorrow morning.明天早晨我去公园.
We must work hard.我们必须努力工作.
I need to ring her riht away.我需要马上给她打电话.
情态动词也有助动词的用法,可以构成一般疑问句,例如:
Can you swim?你会游泳吗?
Will you go to park tomorrow?你明天去公园吗?
May I have your name?我能知道你的名字吗?
Shall we begin now?我们现在就开始吗?
how的意思是怎样,如何,多少
用法如下:
1.how much 多少?多少(不可数的数量)(价钱)
询问价钱:How much is it?这个多少钱?
询问数量(不可数)How much water is there in the glass?玻璃杯里有多少水?
询问重量:How much does the pig weigh?这头猪多重?
询问数字计算的结果:How much is four plus one?四加一等于多少?
2.how many 多少?(可数的数量)
例如:How many students are there?有多少学生?
3.how are you?日常交际最常用的一句口语问候,表示:
4.how do you do?同上,意思也是
5.how long询问长度和时间
例如:
How long does it take to get to your house on foot?步行到你家要多久?(20 minutes20分钟)
How long is the river?这条河多长?
6.how often询问频率
例如:how often do you come here?你多久来这里一次?(once a week一周一次)
7.how soon再过多久.
例如:How soon will you come back?你要多久才回来?
8.How tall询问高度
例如:How tall are you?你多高?
9.How is it going?最近怎么样?事情进展得顺利吗?事情进行得怎么样?过得好吗?
10.表示如何,怎样
例句:I don't know how to do next?我不知道下一步该怎么做?
11.感叹句,多么
例句:How beauitful the girl is?多么漂亮的女孩啊!