1、subject clausesubject1.Some festivals are held to honour the dead.2.It is covered with pink snow.3.Five plus two is seven.4.To do morning exercises is useful for us.5.Having you sit here is a great honor!6.What I want to say is a secret.subject clause一、复合句中充当主语的从句叫主语从句。一、复合句中充当主语的从句叫主语从句。is a secret
2、.conjunctionnsubject clause 二、连接词（二、连接词（conjunction）类别类别连接词连接词连接词连接词thatwhether连接代词连接代词 who;whom;whose;what;which;whoever;whatever连接副词连接副词 when;where;how;why 等等 1.Henry is lost in London and doesnt know _ he should do.2._ he will join us wont make too much difference.3._ the boy didnt take medicine
3、made his mother angry.4._ you come or not is up to you.whatWhetherThat Whether5._team will win the match is a matter of public concern.6.Its uncertain _ the experiment is worth doing.7._ leaves the room last ought to turn off the lights.WhichwhetherWhoever 句首句首sounded reasonable.句末（借句末（借it作形式主语）作形式主
4、语）It is very important三、位置三、位置常用常用itit作形式主语的句型。作形式主语的句型。句型句型例句例句It be+过去分词过去分词(said/reported/believed)+that 从句从句It is reported that China has sent up another spaceship.It be+名词词组名词词组(a pity/a good thing/a surprise/no wonder)+that从句从句It is a pity that Li Ming cant join us.It be+形容词形容词(interesting,imp
5、ortant,good,possible,certain,sure,etc.)+that 从句从句It is impossible that I can finish my job without your help.It+不及物动词（不及物动词（seems，appear，happen，matter）+that 从句从句It seems that she is sleeping now.四、语序四、语序Why did they disappear remains a mystery.Why they disappeared remains a mystery.主语从句中应该用陈述语序 Tips
6、:that 与 what 引导主语从句的区别 That she was chosen made us very happy.What is done cant be undone.that引导主从，不作成分，无意义，只连接what引导主语从句，可作主、宾、表一、改错一、改错 1.Why dont you explain that this is all about?2.Thats what weve given you the letter.3.I dont know that I could survive until morning.4.No one know exactly what t
7、he earth began.5.Whom will go makes no difference.whatwhywhetherhowwhoever二、改写句子二、改写句子 运用所学的主语从句知识改写下面句子。运用所学的主语从句知识改写下面句子。1.Clearly,English is more and more important.2.The reason for dinosaurs disappearance remains a mystery.It is clear that English is more and more important.Why dinosaurs disappe
8、ared remains a mystery.熟读深思熟读深思 Find out the subject clauses from the text.1.What it was to become was uncertain until between 4.5 and 3.8 billion years ago.2.It was not clear whether the shape would last or not.3.What is even more important is that as the earth cooled down，water began to appear on
9、its surface.4.It was not immediately obvious that water was to be fundamental to the development of life.5.What many scientists believe is that the continued presence of water allowed the earth to dissolve harmful gases and acides into the oceans and seas.6.Why they suddenly disappeared still remains a mystery.7.Whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved.exercises on P28 1、2 P29 2homework
