be动词到底表达的是什么含义?什么情况下要用be动词?
题目
be动词到底表达的是什么含义?什么情况下要用be动词?
答案
“be”是个特别动词
“Be”除了原形的“be”之外,还有另外七种形式:am,is,are,been,being,was,were.
在句子中,“be”可以是主动词(The Principal Verb)或助动词(The Auxiliary Verb).
当主动词时,“be”在性质上属于接系动词(The Linking Verb),后面要有名词、形容词、地方副词或短语作补足语(The Complement).例如:
1.The man is a science teacher.
2.Mary's new dresses are colourful.
3.I have been there before.
4.Mother is in the kitchen now.
这四个都是陈述句,可以变成疑问句,方法简单,把主语和“be”或助动词对换位置即可:
5.Is the man a science teacher?
6.Are Mary's new dresses colourful?
7.Have I been there before?
8.Is mother in the kitchen now?
当“be”要在祈使句中出现时,它必须借重助动词“do”或“don't”之助,如:
9.Don't be silly!
10.Do be obedient!
11.Don't be a fool!
“Be”有两种缩写法,如下:
12.He's not./He isn't.
13.You're not./You aren't...
但“am + not”的缩写法只有一个:
14.I'm not.
有人用“ain't”,但这并不是标准英语.
谈过了“be”作主动词的功能,现在看看“be”作助动词时,有些什么用法:
1.“Be + 现在分词”以组成进行式时态(Continuous Tenses),如:
15.Tony's maid is washing his new car.
16.The children are playing in the field.
17.Samuel was eating when I came in.
18.We have been living here since 1959.
2.“Be + 过去分词”以组成被动语态(The Passive Voice),如:
19.Her money in the drawer was stolen.
20.A number of good jobs are taken up byforeigners.
21.David studied in Taiwan but has been trained as a language lecturer in America.
22.Can all the wonderful birds be found in our Bird Park?
23.The disobedient boy was told to stand out- side the classroom.
24.Steps are being taken to reduce traffic con- gestion during peak hours.
25.Dishonest students will be immediately dealt with.
举一反三
已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
最新试题
- 每个多项式最多只有一个公因式吗
- 固态发酵和液态发酵要用不同的酒曲吗?
- it,is,What,time(连词组句)
- 某校五、六年级的学生乘公共汽车去郊游.如果每车坐60人,则有20人没有座位;如果每车多坐5人,则有一辆车空出45个座位.请问:一共有多少辆公交车?五、六、年级去郊游的学生一共有多少人?
- “辣食”用英语怎么说,是hot food
- [(x+2y)(x-2y)-(x+4y)2]÷4y,其中x=5,y=2.
- 直角三角形斜边上的中线把直角三角形分成的两个三角形的关系是面积相等,怎样证明?
- 糖共有10颗,两一堆搪共有10颗,两人轮流拿走1颗或两颗.谁拿到最后一颗糖果谁就获胜.想一想如果让你先拿,怎么列算式
- 改成定语从句!
- 先化简,再求值:(1-x/x+2)·(x2-4/x2-2x+1)÷(1/x2-1)其中x2-x=0.
热门考点