什么情况下be英语动词名词缩写可以缩写?the room's untidy是什么意思?

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be动词的用法口诀和详解:少儿英语语法顺口溜
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be 的用法口诀
我用am,你用are,is连着他,她,它;
单数名词用is,复数名词全用are。
变疑问,往前提,句末问号莫丢弃。
be 的用法口诀
我用am,你用are,is连着他,她,它;
单数名词用is,复数名词全用are。
变疑问,往前提,句末问号莫丢弃。
变否定,更容易,be后not莫忘记。
疑问否定任你变,句首大写莫迟疑。
be动词的用法:be (be/is/are/am/was/were)
现在时 I am, you are, he is, we are, you are, they are (缩略式 I'm, you're, he's, we're, you're, they're), (否定缩略式 I'm not, isn't, aren't), 过去时 I was, you were, he was, we were, you were, they were (过去时否定缩略式 wasn't, weren't), 过去分词been, 现在分词being
英语的&be&是个特殊动词;有些语言,如马来文等,并没有&be&这样的动词。
&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.
这个男子是一位科学教师
2. Mary's new dresses are colourful.
玛丽的新衣服色彩鲜艳
3. I have been there before.
我以前去过那里
4. My mother is watching TV in the room.
母亲现在在客厅看电视 
【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.】&情态动词+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.
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