ly名词性从句2

1). It is known to the world that Mark Twain is a great American writer. 2). What is known to the world is that Mark Twain is a great American writer. 3). As is known to the world, Mark Twain is a great American writer. (as 引导的前置定语从句)
三、It作形式主语的常用句型
有时为避免句子头重脚轻，常用it 代替主语从句作形式主语放于句 首，而把主语从句置于句末。主句的谓语动词一般用单数形式。常 用句型如下：
1.It + be + 形容词 ＋ that从句
It is strange that… 奇怪的是… It’s certain that… 肯定… It is possible that... 很可能…… It is unlikely that... 不可能…… It is obvious that… 很明显… It is necessary \important \natural\... that… +(should) +do…有必要…/重要的是…/很自然…/ It is possible that _______________ (很遗憾)we lost the match.
It is obvious that *______________
(这是事实)he cheated in the exam.
2.It + be + 名词 ＋ that从句 It is a pity/shame that..遗憾的是…… It is a surprise that… 令人惊奇的是… It is a fact that… …是事实 It is an honor that …非常荣幸 It is common knowledge that… …是常识
Homework
请根据以下表格内容，以How to learn English well?为题写一 篇短文，可以自由发挥，在短文中尽可能运用主语从句。
How to learn English well? 为什么 要学好英语
英语是应用最广泛的语言，据报道， 很多人都把英语作为第一或第二语 言。 不好放弃，虽然英语有时很难。 多练习，熟能生巧是有道理的。 最重要的是养成良好的学习习惯， 比如利用字典、多和老师交流等。
四、主语从句中的主谓一致 1.主语从句作主语,谓语动词一般用单数； 2.由两个或多个连接词引导一个主语从句， 谓语动词用单数。 3.由and连接两个或两个以上的主语从句作主语， 谓语动词用复数； 4.What引导主语从句时，主句的谓语动词由表语决定。 1.What I need is your help. 2. What I need are some books. 3.When and where the meeting will be held hasn’t been decided. 4..What we will do next and how we do it are not decided.
• 一、改错 • 1：That she wants to know is which dress What she should buy. • 2: he ThatHe will give up his job surprises all of us. • 3:NoWhoever breaks the law will be matter who punished. Whether meeting will be held in our school is • 4:If the not known yet. • 5: That worried her a bit was that he What couldn’t get in touch with her friend. • 6: It is said he has gone to America. He
如何学好英语
How to learn English well? It is well known that English is used most widely in the world. It is reported that many people use English as the first or second language. We should try our best to learn English well. But how can we learn English well? First, we shouldn’t give up. It’s true that English is sometimes really very difficult for us. But if we hold on, I think we will be good at it. Also, I think if we do a lot of practice, we will make progress, we should speak more and listen more often. That practice makes perfect is true. What is most important is that we must form a good habit of learning English. Such as, making good use of the dictionary and turning to the teachers when in trouble, I think If we do that, we’ll be able to learn English well easily.
It is no wonder that…并不奇怪/无疑…
It is a pity that *_______________(很遗憾)we lost the match. It is a fact that *______________(这是事实)he cheated in the exam.
3.It is ＋ 过去分词 ＋ 从句
Grammar
名词性从句之主语从句
1.了解并掌握主语从句的相关概念 2. it在主语从句中作形式主语的用法 3.重点：主语从句的句序、主谓一致。 4.难点：引导主语从句的连接词的使用
一、主语从句的定义： 主语从句：在复合句中充当主语的从句, 通常
放在主句谓语动词之前或由形式 主语it代替,而本身放在句子末尾。 1.His job is important 2.What he does is important 3. How the book will sell depends on its author 4. That he is the best student in the class is obvious.
四、主语从句中的主谓一致
1.That he will come is certain. 2.Whether it will please them is not easy to say. 3.What seems easy to some people seems difficult to others. 4.Which side will win is not clear. 5.Why he did it remains a mystery. 6.When they will start is not known yet.
Find the subject clauses in the following sentences, and think about what are the connectors (连接词) . 1That he will come is certain. 2Whether it will please them is not easy to say. 3What seems easy to some people seems difficult to others. 4Which side will win is not clear. 5Why he did it remains a mystery. 6When they will start is not known yet. 7How he became a great scientist is known to us all. 8Who will take part in the meeting has not been decided. 9Whoever breaks the law will be punished. 10Where she is from is unknown.
二、主语从句的引导词： 连词 that , whether 连接代词 who(ever), whom(ever), which(ever), what(ever) 连接副词 where ,when ,why ,how （根据从句在句子中的位置） 主语从句+谓语 主语从句的句序 it（形主）+that（真主） •
6.How and why he did the experiment are unknown to all. 7. How he did the experiment and why he did the experiment is unknown to all. 8. When he did the experiment has not been decided yet. 9.It is not known yet if the meeting will be held in our school 10. Why was Lily late is not important.
It is reported that… 据报道… It has been proved that… 已证实… It is said that… 据说… It is believed that… 人们相信… It is known to us/all that …. 众所周知… It must be pointed out that… 需指出的是…… It is insisted/ suggested /advised/ordered/ requested/required/that + (should）do... 坚持/建议/ 命令/要求…… It is reported that *___________________(据报道)20 people were killed in the accident. It is suggested that *______________________(建议)we should eat more vegetable and do more exercise
4.It ＋ 不及物动词 ＋ 从句 It seems that… 似乎… It appears that… 似乎… It happened that... 碰巧…… It occurred to me ቤተ መጻሕፍቲ ባይዱhat…我突然想起… It seems to me that you object to the plan.
主语从句需注意的问题
1.主语从句必须有引导词。 2.that引导主语从句时不能省略。 3.if不能引导位于主句的主语从句，它可以引导
带有形式主语it的主语从句。
4.what及wh-ever词引导主语从句时需亲 自作主语。 5. 主语从句用陈述句语气。
Consolidation (巩固一下吧) 1.They should like each other is natural. 2. What you said is of great importance. 3.It is natural that they should like each other. 4.If Mary really heard him is really doubtful. 5.It was doubtful if Mary really heard him.
It happened that *________________(刚好)I came into the office at that time. It occurred to me that *____________________(我突然想起)I forget to sent the letter.
五、主语从句中的主谓一致
判断下列句子是否正确
1. How and why he did the experiment is are unknown to all. × 2. How he did the experiment and why he did the experiment are unknown to is all. × 3. When he did the experiment has not been decided yet. √