考点一主语从句1．引导主语从句的连接词：从属连词that，whether/if连接代词what，who，whom，whose，whatever，whichever，whoever等；连接副词when，where，why，how，whenever等。
①That they were in truth sisters was clear from the facial similarity between them.从她们的面貌相似度就能清楚地看出她们真是亲姐妹。
②What struck me most in the movie was the father's deep love for his son.影片中最打动我的是父亲对他儿子深深的爱。
2．主语从句一般放在句首，但有时也可用it作形式主语，而将主语从句移到句子的末尾。
常见的句型：(1)It＋be＋形容词(necessary/likely/important/uncertain等)＋that从句(2)It＋be＋名词(短语)(a pity/shame/no wonder/no surprise等)＋that从句(3)It＋be＋过去分词(said/reported/decided/believed等)＋that从句(4)It＋不及物动词(seem，appear，happen等)＋that从句①It is uncertain what side effect the medicine will bring about，although about two thousand patients have taken it.尽管大约两千名患者已经服用了这种药，但是它会带来什么样的副作用还不清楚。
②It's no surprise that our team has won the game.我们队获胜一点都不令人吃惊。
③It is decided that the meeting will be put off till next Monday.会议被推迟到下周一召开已经定下来了。
考点二宾语从句1．引导宾语从句的连接词：从属连词that，whether，if；连接代词what，who，whose，whatever，whichever，whoever等；连接副词when，where，why，how等；从句用陈述语序。
①(2016·浙江高考)Nobody entering a university knows exactly what they want to study.进入大学的人中，没有人确切知道他们想学什么。
②We promise whoever attends the party a chance to have a photo taken with themovie star.我们许诺，任何参加这个聚会的人都有跟那个电影明星合影的机会。
③(2015·北京高考·单项填空)I truly believe that beauty comes from within.我确信美来自内在。
④(2015·重庆高考·单项填空)We must find out when Karl is coming，so we can book a room for him.我们必须弄清楚卡尔什么时候来，以便我们可以为他预订房间。
2．it作形式宾语的宾语从句(1)一些动词后的宾语从句有宾语补足语时，则需要用it作形式宾语，而将that引导的宾语从句后置。
常见的这类动词有：find，feel，think，consider，believe，guess，suppose，make等。
He has made it clear that the meeting will not be postponed.他清楚地表明会议不会被推迟。
(2)动词hate，like，dislike，appreciate，enjoy等表示“喜欢”、“厌恶”的动词以及一些动词短语see to，depend on，rely on等常用it作形式宾语，而将宾语从句后置。
I shall see to it that he is taken good care of when you are absent.你不在的时候，我会确保把他照顾好。
考点三表语从句1．引导表语从句的连接词：从属连词that，whether；连接代词what，who，whose，whatever，whichever，whoever等；连接副词when，where，why，how 等；从句用陈述语序。
①Jerry did not regret giving the comment but felt that he could have expressed it differently.杰里不后悔给出评论，但是觉得自己本来可以用不同的方法来表达的。
②I'd like to start my own business－that's what I'd do if I had the money.我愿意自己创业——那就是如果我有钱将会做的事情。
2．as if/as though引导的表语从句as if/as though引导的表语从句常跟在be动词，seem，look，taste，sound，feel，appear等动词之后。
The thick smog covered the whole city.It was as if a great black blanket had been thrown over it.浓雾覆盖着整座城市。
好像把一个巨大的黑色的毯子扔到它的上面。
3．because ，why 引导的表语从句because ，why 也可引导表语从句，但because 引导的表语从句，主语不能是reason 或cause(该结构常用that 引导)。
常用于以下句型：⎩⎨⎧This/That is/was why...这/那是……的原因This/That is/was because...这/那是因为……The reason why...is/was that...……的原因是……①From space ，the earth looks blue.This is because about seventy-one percent of its surface is covered by water.从太空中看，地球是蓝色的。
这是因为地球表面大约71%被水覆盖。
②The reason why he didn't pass the exam was that he was too careless.他没有通过考试的原因是他太粗心了。
考点四 同位语从句同位语从句在句中作某一名词的同位语，位于该名词之后，用以说明该名词的具体内容。
1．常见的后跟同位语从句的名词有：advice 建议conclusion 结论 demand 要求 doubt 怀疑fact 事实hope 希望 idea 主意information 信息 message 消息 news 消息order 命令 possibility 可能性 promise 诺言question 问题 request 请求 suggestion 建议 thought 想法 plan 计划①I made a promise to myself that this year ，my first year in high school ，would be different.我对自己承诺：今年，我高中的第一年，会有所不同。
②(2016·天津高考)The manager put forward a suggestion that we should have an assistant.There is too much work to do.经理提出了我们应当有一位助手的建议。
要做的事情太多了。
2．引导同位语从句的连接词有：that，whether，how，where，when，why 等。
①Evidence has been found through years of study that children's early sleeping problems are likely to continue when they grow up.通过多年的研究发现：有证据表明孩子的早期睡眠问题很有可能会随着他们的成长继续下去。
②She asked a question why there was a delay.她问了发生延误的原因。
③I have no idea when he will come back home.我不知道他什么时候回家。
[名师点津]在同位语从句中，that，whether不作句子成分。
that无实义，whether意为“是否”，if一般不引导同位语从句。
引导同位语从句的连接词一般都不能省略。
[易错警示]引导名词性从句时，that没有词义，在从句中不作任何成分。
当从句意义完整，不缺任何成分时，往往选用that；而what引导名词性从句时，意为“什么”或“……的”，在从句中用来作主语、表语或宾语。
核心考点针对练Ⅰ.单句语法填空1．(2017·凉山州二次诊断)The happiest people enjoy each age gives them.2．(2017·常德模拟)Only you know is best for you.3．(2017·山西重点中学协作体二模)My mother knew where we were at all times.She knew our friends were.【导学号：30892197】4．(2017·中原名校模拟)I had no idea of a stage manager actually did.5．(2017·安庆模拟)Experts aren't still sure exactly how dreams work，but what is certain is they are necessary for our mental health and that everyone hasdreams.6．(2017·海淀一模) astonishes us is that AlphaGo defeated the human champion.7．(2017·银川一中一模)They often think that their parents are out of touch with modern ways，they are too serious and too strict with their children，and that they seldom give their children freedom.8．(2017·温州十校联考)When you are reading，make a note of you think is of great importance.9．(2017·瑞安四校联考)His writing is so confusing that it's difficult to make out it is that he is trying to express.10．(2017·艾青中学质检)If you are going to kill the snake，you have to get close to the head is and cut it off.高考题型综合练语法填空A mason(泥瓦匠)working on a Kansas university stadium found 1 88year-old handwritten note，which gives a glimpse into the lives of workers in 1928.The mason found the note in a tobacco can while 2 (replace)stones.It is discovered that the five authors 3 (write)the note on Feb.2，1928，4 (hope)the letter would be found someday in the future，perhaps after they died.The nearly 100-word message explains that masons made $10 per day and other workers made $ 3.20 per day.It also expresses the hope 5 “things will be better”for the working men in the future.The document will be sent to a museum for cleaning and 6 (protect)covering.There aren't plans 7 (display)the document at the moment，but it could 8 (possible)be displayed in the stadium when the project is completed.“It is possible that the note will be either exhibited as the original item 9 it will be digitized and we can put a copy out so the light doesn't cause the letter to fade worse，”Hight said.The project manager of Kansas State，Jeremy Sharp，says that the stadium 10 (build)in 1922，and the eastern wall was constructed in 1928.。