主语从句讲解PPT课件

1、Grammar What part does the underlined part serve as in each sentence? A tree has fallen across the road. You are a student. To find your way can be a problem. Smoking is bad for you.第1页/共17页 “How do you do?” is a greeting. What she said is not yet known. That we shall be late is certain. Whether he

2、will go there is not known . How we can help the twins will be discussed at the meeting.第2页/共17页定义： 用作主语的从句叫主语从句，它是名词 性从句之一。引导主语从句的连接词有： 从属连词: that, whether； 连接代词: who (whoever), whom, whose, what (whatever)和which (whichever)； 连接副词: when, where, how和why。第3页/共17页1.连接词：1）从属连词：that， whether 引导主语从句只起引导作

3、用，在主语从句中不充当任何成分，that本身无实际意义，但不能省略. whether意为“是否”，放在句首句末皆可。 Thatpricewillgoupiscertain.Thathewillcomeiscertain.Whetherwegobytrainorbyboatmakesnodifference.Whetherhellcomehereisntclear.第4页/共17页2)连接代词 who ( whoever) , what (whatever ), which (whichever), whom, whose .Whichsidewillwinisnotclear.Whowillw

4、ritethepoemhasnotbeendecidedyet.Whateverhedidisright.Whokilledthescientistremainsaquestion.Whomsheborrowedmoneyfromstillpuzzledhim.第5页/共17页3)连接副词when，where， how， why等。Howthishappenedisnotcleartoanyone.Whenhewillbebackdependsontheweather.Whenwellstarttomorrowwillbetoldsoon.Wherethetestwillbegivenisno

5、tyetdecided.第6页/共17页Make sentences :Its certain .well be late. Is he coming or not ？We dont knowWhat does he want to tell us?We dont knowWhen will you come back?It doesnt matter.Its certain that we will be late.That well be late is certain.We dont know whether he is coming or not .Whether he is comi

6、ng is not known.We dont know what he wants to tell us.What he wants to tell us is not known.When you will come back doesnt matter.It doesnt matter when you will come back.第7页/共17页主语从句后置! 为了避免主语冗长,句子头重脚轻,经常用 it 作 形式主语,主语从句放在后面作真正的主语. 例: That we shall be late is certain. - Its certain that we shall be

7、 late. 1. That the earth is round is known to all. - 2. That you missed the chance is a pity. - It is a pity that you missed the chance.Its known to all that the earth is round.第8页/共17页A.It+be+形容词+that从句(obvious,true,surprising,good,wonderful,funny,possible,likely,certain,probable,etc.) 如：It is cert

8、ain that she will do well in her exam. B.It+be+名词词组+that从句(anhonour,afact,apity,etc）如：Its a pity that we cant go. 第9页/共17页C. It + be + 过去分词 + that 从句 (said, reported, thought, expected, decided, announced, etc。） 如：It is said that Mr. Green has arrived in Beijing. D. It + 不及物动词或短语 + that 从句( seem，hap

9、pen, doesnt matter ,turn out） 。如：It happened that I was out that day. It doesnt matter whether she will come or not. 第10页/共17页1）主语从句在句首时，必须由连接词引导，不能省略这些连接词。误：They should like each other is natural.2)如果主语从句放在句首，不能用if引导，但是如果用it 做形式主语，而把主语从句放在句末时，也可以用if引导.误：If Mary really heard him is really doubtful.注

10、注 意意正： Thattheyshouldlikeeachotherisnatural. Itisnaturalthattheyshouldlikeeachother.正：WhetherMaryreallyheardhimisreallydoubtful.ItwasdoubtfulifMaryreallyheardhim.第11页/共17页1. What you left are only several old books.2. What you said is of great importance.3）主语从句中用陈述语序,后面的谓语动词用第三人称单数4）“what”引导主语从句时，谓语

11、动词： 常与其后的名词作表语一致 ，且根据句子的语境而定。 eg：5) . 用于 It is important / natural / necessary / impossible that.句型中, 主语从句应使用虚拟语气, 用“should + 动词原形”的形式, should有时可以省略。6) . 在 It + be + suggested/advised/ordered/requested/ insisted/required 中, that从句的谓语也应该用“should + 动词原形”的形式, should有时可以省略。第12页/共17页1.Where shall we spen

12、d the holiday isnt decided.2.You have made a mistake is a fact.3.That is certain that we can win.4.No matter who leaves the room last ought to turn off the lights.5.If the policemen will come is not certain.we shallThat you haveIt isWhoeverwhether改错练习第13页/共17页6.It is say that he was a famous writer.

13、7.It is seemed that it is going to rain soon .8.That is fact that she won the first place.9. Who leaves the room last ought to turn off the lights.10.It is important that a student learns a foreign language.said seemsIt is a factWhoevershould learn第14页/共17页1._ he made an important speech at the meeting was true. A. That B. Why C. What D. How 2. _well go camping tomorrow depends on the weather . A If B Whether C That D Where 3._ is known to us all that America is a developed country . A Which B As C What D It 第15页/共17页4. Its known to us all _ a form of energy . A. water is B. that wate