Then arose the question where we were to get the machines needed.(同位语从句）
(五).特殊句型要牢记：
(1).It is said/believed/reported/thought/well-known that--------- (2).It turned out that------“结果是，原来是-----” (3).It happened that------“碰巧--------”
(4).It occurred to me that------= It struck me that-------“突然想起------” (5).Word came that------“有消息传来 说---------”
(6).It seems/appears that-----------“似乎是，好像是---------”
(7).It is a pity/a fact/no wonder that-------“真遗憾、是事实、难怪------” (8).It is possible/probable/likely that-------
(9).It is important/necessary/strange that--------{从句中用虚拟语气:（should ）+ 动词原形} (10).It is certain that-------
(11).It follows that-------“于是乎，从而--------” (12).There is no point in doing sth. There is no need to do sth.
(13).It is up to sb to do sth. “该由某人做某事，由某人负责” (14).It is just like sb to do sth.“某人恰恰是这个样子”
(15).See to it that----- = Make sure that------“务必。确保”
(16).How did it come about that you were late again yesterday? 六、弄清一组句型的区别：
(1)It was not until----that------（强调结构）
(2).It was +时间段+ago 或 +介词短语+that------(强调结构） (3).It was+时间点名词+when------\当----时已是----时间了”
(4).It is/was/will (not) be +时间段名词+ before------（肯定句）“过多久---就/才-----” (否定句）“不久----就/才-----” (5)It is+ 时间段 +since------- 例如：
(1).It was not until yesterday that I received his letter. (2).It was on the coasts that lots of people disappeared. (3).It was 3 years ago that he arrived in Australia. (4).It was 10 o'clock in the evening when he came back. (5).It will be hours before he arrives here.
(6).It was not long before they drove the enemy from their homeland.
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(7).It is 3 days since we left our school.
(8).It is 10 years since I was a teacher.(我不当教师已经10年了) (9).It is 5 years since he lived in London.(他有5年不在伦敦住了)
定语从句
1.什么叫定语从句？先行词？引导词？定语从句的位置如何？ (1).A plane is a machine that can fly.
(2).The noodles that I cooked were deliicious. (3).Who is the man that is reading over there?
(4).The girl that we saw yesterday was Jim's sister. (5).The fish which we bought were not fresh. (6).Who is the person whom you just talked to?
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(6).Mrs. Read is the person to whom you should write. (7).I still remember the day when I first came to Beijing. (8).This is the house where we lived last year.
(9).The factory where his father works is in the west of the city. (10).Wei Fang is the student whose home caught fire last night.
2.定语从句的引导词分为5个关系代词:（1).who--指人，在从句中作主语。（2).whom--指人，在从句中作宾语。(3).whose--指人或物，在从句中作定语。(4).which---指物，在从句指作主语或宾语;which还可以作定语起到限定词的作用（this/that/these/those),但其前面必须有介词。(5).that--指人或物，在从句指作主语或宾语。(5)as---指人或物，在从句中作主、宾、表，既可以引导限制性定语从句(the same-----as, such---as, as/so---as),也可以引导非限制性定语从句（位置灵活).
3个关系副词:(1).when--指时间，在从句中作时间状语。(2).where--指地点，在从句中作地点状语。(3).why--指原因，在从句中作原因状语。
注意：判断用关系代词还是用关系副词，主要取决于什么？ 取决于引导词在从句中所充当的成分：
若引导词在从句中充当主语、宾语、定语时，须用关系代词；若引导词在从句中充当状语时，须用关系副词。
(1).I'll never forget the day______you saved me. That's the special day_______I'll never forget. (2).This is the house______my aunt lived last year. This is the house______my aunt bought last year.
(3).We'll visit the village,______was once the site of a famous battle. We'll visit the village,______a famous battle once took place. (4).Oct.1,1949 was the day______we'll never forget.
Oct.1,1949 was the day______the PRC was founded.
(5)He lost his temper, at which point I decided to go home.此时我决定回家
(6)Chaplin went to the States in 1910, by which time he had learned to dance and act in comedies.
(7)His son insisted on joining the army, in which case he had to give in.
(8)
3.一般来说，that/which都可以指物（可互用），但在下列情况下，必须用that指物，不用which.
(1).当先行词本身为不定代词时：all,much,little, sth,anything,everything,noyhing. (2).当先行词被adj最高级/序数词修饰时。
(3).当先行词被the very(正是、就是)、the only、the last修饰时。 (1).All that glitters is not gold.
All that can be done has been done. You can take any room that you like.
There is no difficulty that we can't overcome. This is the last time that I'll give you a lesson. This is the very book that I'm after.
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China is not the country that it used to be.(关系代词在从句中作表语时） 4.As引导的定语从句：(as在定语从句中必须充当成分：主语、宾语、表语) (1).The same--------as-------- (2).Such----------as--------
(3).As-clause, main-clause.==Main-clause, as-clause. (4).such/as-------as-------
(5)as/so------as--------
(1).As we know, more than 70 % of the earth's surface is covered by water. (2).This elephant is like a snake, as anybody can see. (3).This kind of computer,as is well-known,is out of date. (5).This is the same bag as I lost yesterday. (6).I have the same trouble as you (have).
(7).Don't talk about such things as you do not understand. (8).Air is a gas, as is known to us. As we all know, air is a gas. Air, as we know, is a gas.
(9)He can lift so heavy a stone as no one else can.
比较：This is so heavy a stone /such a heavy stone that no one can lift it.(结果状语从句) This is so heavy a stone/such a heavy stone as no one can lift.(定语从句）
注意：1.as引导的非限制性定语从句常有，只能指代整个主句的内容，不能指代单个先行词：“如同---
----那样”：
as we know/as is known to all, as we all can see, as has been said before/above, as has been
pointed out, as might be expected(正如所预料的那样), as is often the case(情况常常是这样),
2.which在非限制性定语从句中，既可以指代整个主句，也可以指代单个先行词。指代的是先行词
本身而不是主句时，不可用as代替which.
3.在非限制性定语从句中作主语时，which既可作系动词be的主语，也可作实义动词的主语，而as
只能作系动词be的主语。
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(1)The apple tree, which I planted last year, has not any fruit. (2)He married her, which/as was natural.
(3)He saw the girl, which delighted him. 5.特殊的句型
(1).Do all one can to do sth. Do what one can to do sth. Do/try one's best to do sth.
(2).I don't like the way (that) you walk
I don't like the way (in which) you walk.
(3).This/It is the 1st/2nd time that I have done sth. This/It was the 1st/2nd time that I had done sth. (4).He lives in the house whose window faces south.
He lives in the house the window of which faces south. He lives in the house of which the window faces south.
(5).He entered the meeting hall, in the front of which were sitting some important men. (6)比较：As is reported in the newspaper, talks between the 2 countries are making progress.
It is reported in the newspaper that talks between the 2 countries are making progress.
What is reported in the newspaper is that talks between the 2 countries are making progress.
(7)We went up to the roof, from where we had a good view of the procession. They stood near the window, from where we could see the whole garden.
注意：(1)No/never/not--------先行词-------But----= that------not或who------not：“没有--------不----的”
(2)当先行词是case,condition, situation, position, point, stage 等名词时，表示情况、方面、处境
时，用关系副词where.但先行词是occasion时，用关系副词when. (!)There was no man but admired him=no man who didn't admire him.
(2)There is no dificulty but may be smoothed away.=no difficulty that may not be smoothed away.
(3)There are some cases, where this role doesn't hold good.（适用)
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