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to have been，seem to do sth因为 found ，所以用to have been
each having over 100 workers 独立主格结构知，公式是：名词/代词 + 分词 + 其它道each代词作逻辑主语内 having 现在分词over100 workers名词短语作分词的宾语
wouldn’t be,前面的假设是在过去。但结果却是在现在(the housing problems now)所以应该用对现在虚拟的结果句中的容虚拟语气结构，即情态动词+动词原形。
to be 用在It be + adj. for...to do sth的结构中
Be she rich or poor 为倒装结构完整形式为：however rich or poor she is； 或者 No matter how rich or poor she is.
= Whatever she is rich or poor, ...
= No matter she is rich or poor, ...
就是一种固定用法，zhidao记住就是了。没必要弄明白具体原因，除非以后要当老师，讲版课。
中文里边 我走了先 = 我先走了； 快点走 = 走快点。语法不语法的，是研究这些的权人去解释的，平常人，会使用，能理解，足矣。
第e799bee5baa6e59b9ee7ad9433517题 I think it advisable that he _____ for Tokyo soon.
C、leave
第18题 _____ ,I will take her as my wife.
C、Be she poor or rich
第19题 It is high time that this wrong spending _____ .
C、was checked
第20题 _____ education is the principal way of gaining status in a culture that generally stresses achievement, skillfulness, and upward mobility.
A、To acquire
第21题 We are planning _____ for the entrance examination for postgraduate.
C、to register
第22题 ？ The most urgent problem now we are facing is _____ to learn the needed materials for the matriculation of postgraduate.
B、to make our every effort
第23题
—Where should I send my application? —The Personnel Office is the place _____ it to.
D、to send
第24题 _____ ，he would have come to class.
D、If Mike had been able to finish his homework
第25题 _____ from others, one should take his promise.
A、To get confidence
第26题 Some〔1〕types of naphtha(石油脑) are employed to dissolving〔2〕rubber〔3〕and to thin paints and〔4〕varnish.
B、dissolving
第27题 The Statue of Liberty was originally〔1〕proposed〔2〕in 1865 to commemoration〔3〕the alliance〔4〕of France with the American colonies during the American Revolution.
C、commemoration
第28题 The purpose〔1〕of inductive logic〔2〕is to inferring〔3〕general laws from particular occurrences〔4〕.
C、to inferring
第29题 Derive〔1〕mineral resources from〔2〕sedimentary rock〔3〕is a〔4〕major modern industrial activity.
A、Derive
第30题 _____ in the matriculation for postgraduate in a short time is really a hard nut.
A、To make high scores
第31题 John admitted that it's always difficult _____ .
C、for him to be on time
Be she rich or poor 为倒装结构
完整形式为：however rich or poor she is； 或者 No matter how rich or poor she is.
-------------------------------以下知识点的最后一条讲了这个语法-------------------------------
关于倒装机构
英语句子的基本结构是主语在前，谓语在后，但是出于修辞上的需要，我们常使用倒装结构。谓语都放在主语的前面称为全部倒装；只把谓语的一部分（如助动词、情态动词或7a64e4b893e5b19e362系动词be）放在主语前面称为部分倒装。倒装句内容繁杂，难以把握，但按照下列法则归类，便可达到事半功倍的效果。
一、结构倒装
1. there be句型。用全部倒装。如：
There are two books on the desk.
桌子上有两本书。
There lived an old couple in that house.
有一对老夫妇住在那栋房子里。
2. 疑问句。用部分倒装。如：
What are you going to do today?
你今天要做什么？
Do you often get up at 6:00 in the morning?
你每天经常6点起床吗？
注意：疑问词作主语的句子不倒装。
3. 表示祝愿或感叹的句子。用部分倒装。如：
May you succeed! 祝你成功！
Isn”t it wonderful! 这多好呀！
How blue the sky is! 天空多蓝呀！
4. 直接引语位于句首的陈述句，主语是名词时用全部倒装。如：
“We will put off the meeting” said the headmaster.
校长说：“我们将推迟这次会议。”
二、强调倒装
1. 副词there, here, up, down, now, then, in, out, away, over, on, off, soon, thus 等位于句首，且主语是名词时谓语常用be或表示位移的动词，用全部倒装。如：
Here comes the bus. 汽车来了。
The door opened and in came a strange man.
门开了，闯进一个陌生人。
注意：代词作主语时不倒装。如：
Away they all went.
他们一下子都走了。
2. 介词短语、形容词、分词等位于句首时用全部倒装。如：
In front of the village is a small river.
村子前面有一条小河。
Present at the meeting were all the teachers and students in our school.
全校师生都出席了会议。
Lying on the floor was an old woman.
躺在地板上的是位老太太。
Seated on the grass are some students singing and laughing.
一些学生坐在草地上，唱着、笑着。
3. 有些含否定意义的副词或短语seldom, hardly, scarcely, barely, never, little, not, nowhere, at no time, no sooner… than…, not until, not only… but also…, by no means, hardly (scarcely)… when…等，或表示时间的副词或短语always, often, once, then, many a time, now and then, every three hours等位于句首时用部分倒装。如：
Seldom have I met him recently.
最近我很少碰到他。
No sooner had they reached home than it began to rain.
他们刚到家，天就下雨了。
Nowhere was the boy to be found.
哪儿都找不到这个孩子。
Not until the sun had set did they stop working.
直到太阳落山他们才停止工作。
Often did we persuade him not to smoke.
我们经常劝他不要吸烟。
Many a time have I seen him sitting there thinking deeply.
我多次看见他坐在那里沉思。
4. “only＋状语”位于句首时后面的句子用部分到装。如：
Only by working hard can you make great progress.
只有努力，你才能取得更大的进步。
Only when the war was over in 1945 was he able to get back to his motherland.
直到1945年战争结束后，他才能够回到他的祖国。
5. “so (such)… that…”结构中的so或such位于句首时前半句用部分倒装。如：
So wonderful was the film that everyone was deeply moved.
这部电影如此精彩，每个人都被深深打动了。
Such a good student is she that our teachers all love her.
她是那么好的一个学生，我们的老师都喜欢她。
三、省略倒装
1. 省略了if的虚拟条件句，把had, were, should, would, could或did提到句首时，构成部分倒装。如：
Had we left a little earlier, we could have caught the train.
我们要是早点动身就赶上火车了。
Should Albert start tomorrow morning, I would get everything ready now.
要是阿尔伯特明天出发，我今天就得把一切准备好。
Did time permit, we might finish the task.
如果时间允许，我们也许能完成这项任务。
2. neither/ nor（否定）或so（肯定）位于句首，表示前面所说的情况也适用于另外一个人或物时用部分倒装。如：
He can not speak English, neither can his sister.
他不会讲英语，他的妹妹也不会。
Tom is a good student, so is Mary.
汤姆是个好学生，玛丽也是个好学生。
四、让步倒装
1. as或though引导的让步状语从句，把形容词、副词、动词或名词（不加冠词）放在句首时常用部分倒装。如：
Hard as he worked, he still failed in the exam.
尽管他很用功，但他考试还是不及格。
Child though he is, he knows a lot of things.
尽管他还是个孩子，他却懂得很多事情。
2. however之类的词，位于句首时用部分倒装。如：
However hard the work may be, we must do it well.
无论工作有多难，我们都必须把它做好。
Whoever you may be, I will not let you in.
不管你是谁，我都不会让你进来。
3. 动词前置
be动词用原形，用部分倒装。如：
Say what you will, I won”t change my mind.
无论你说什么，我都不会改变主意。
Be he poor or rich, she will marry him.
无论他是穷还是富，她都会嫁给他。