【课件】Unit+1+Discover+Useful+Structures+表语从句人教版（2019）选择性必修第二册

Unit1discoverusefulstructures表语从句MissLin2023.3.13目录1、leadin:课文例句与系动词回顾2、concept:表语从句的概念与引导词3、importanceanddifficulties:表语从句的重难点4、exerciseinthetextbook:教材练习5、Extendedtraining:扩展训练ThetruthwasthatthewaterfromtheBroadStreetpumphadbeeninfectedbywaste.Leadinpredicativeclause表语从句事实/真相的内容是….回顾：系动词的分类状态类：be动词，seem,appear,keep,remain,stay…感观类：look,smell,taste,sound,feel…变化类：become,get,turn,grow,fall,come,go…Linkingverbsreview找出下列句子中的表语判断表语的主要依据就是表语在系动词之后。(系表结构）链接教材1.（教材P2）One

theory

was

that

bad

air

caused

the

disease.2.（教材P5）You

may

not

believe

it,

but

that

was

what

happened

at

the

initial

stage

of

our

group’s

research

on

developing

a

vaccine

for

malaria.3.（教材P5）What

Snow

was

determined

to

find

out

was

why

the

1854

outbreak

of

cholera

in

London

could

have

caused

over

500

deaths

within

ten

days.4.（教材P5）We

realised

that

what

we

cared

about

was

not

what

aspect

we

needed

to

develop

a

theory

in,

but

rather

how

we

can

reduce

the

cost

of

a

vaccine

without

reducing

its

effect!观察并归纳：1.

所有例句中的蓝框部分都位于___________后，作表语，故都是_______从句，这些从句相当于一个_______。系动词be表语名词2.

句一由从属连词______引导；句二由连接代词_______引导；句三由连接副词_______引导；句四由连接代词_______引导。thatwhatwhywhat表语从句的概念

表语从句放在系动词（也称连系动词）之后，充当复合句中的表语，说明主语是什么或者怎么样。一般结构为“主语+系动词+表语从句”。可接表语从句的系动词有be,

look,

remain,

seem等。concept类别引导词用法从属连词that只起连接作用，不作句子成分,

无实际意义whether只起连接作用,

不作句子成分，意为“是否”，不能用if替换连接代词who,

what,

whom,

whose,

which等在从句中作主语、宾语、表语等表语从句的引导词类别引导词用法连接副词when,

where,why,

how等在从句中作状语其他连词because主句主语一般不用reasonas

if/as

though表语从句表示的情况发生的可能性较小时，常用虚拟语气表语从句的引导词

Importanceanddifficulties表语从句中引导词的选择1.由连接词that,

whether引导的表语从句从属连词that的用法：①无意义；②不充当成分。而whether有词义，意为“是否”。这时主句的主语常常是些抽象名词，如

question,

trouble,

problem,

result,

chance,

suggestion,

idea,

reason

等。表语从句对主句主语进行说明、解释，使主语的内容具体化。The

reason

for

his

absence

is

that

he

hasn’t

been

informed.他缺席的原因是他没被通知。The

point

is

whether

we

should

lend

him

the

money.关键在于我们是否应该借钱给他。2.由连接代词引导的表语从句在连接代词who,

what,

which,

whom,

whose等引导的表语从句中，连接代词在句中作主语、宾语、表语等，并且不能省略。The

question

is

which

of

us

should

go.问题是我们哪一个应该去。The

problem

was

who

could

do

the

work.问题是谁能做这项工作。That’s

what

he

is

worrying

about.那就是他在担心的事。表语从句中引导词的选择3.由连接副词引导的表语从句在连接副词

when,

where,

why,

how

等引导的表语从句中，连接副词在从句中作状语。Go

and

get

your

coat.

It’s

where

you

left

it.去把你的衣服拿来。就在你原来放的地方。I

had

neither

a

raincoat

nor

an

umbrella.

That’s

why

I

got

wet

through.我既没雨衣也没伞。那就是我湿透的原因。That

is

how

mice

ruin

large

scores

of

grain

every

year.那就是老鼠每年是怎样损害大量粮食的。表语从句中引导词的选择4.由连词because,

as

if/as

though等引导的表语从句It

looked

as

if

it

was

going

to

snow.看起来好像要下雪了。That’s

because

we

never

thought

of

it.那是因为我们从未想过此事。It

seems

as

though

he

didn’t

know

the

answer.看起来他好像不知道答案。表语从句中引导词的选择ExerciseinthetextbookAnswerthefollowingquestionsusingtheinformationfromthereadingpassageaswellasthepredicativeclauses.WhatwasitthatJohnSnowshowedtotheworld?→WhatJohnSnowshowedtotheworldwashowcholeracouldbeovercome.1.WhatwasSnow'sdiscoveryintwoparticularstreetsinLondon?Snow'sdiscoveryintwoparticularstreetsinLondonwasthat________________________________________________________________________________________________________.2.WhatwasSnowdeterminedtofindoutduringthe1854outbreakofcholerainLondon?WhatSnowwasdeterminedtofindoutwaswhy________________________________________________________________________________________________________.thecholeraoutbreakwassoseverethatmorethan500peoplediedintendaystheoutbreakofcholerahadcausedover500deathswithintendays3.WhatweretheexactplacesSnowmarkedonthemap?TheexactplacesSnowmarkedonthemapwerewhere___________________________________________________.4.WhatwasthefindingthatSnowannounced?Snow'sfindingwasthat_______________________________________________________________________________________________________________________________________________________________________________________.allthosewhodiedhadlived/allthedeadpeoplehadlivedthewaterpumpwastoblameforthespreadofcholera/thepumpwatercarriedcholeragerms/waterfromtheBroadStreetpumphadbeeninfectedbywasteDavidistalkingtoMariaabouttheirscientificresearchproject.FirstcompleteDavid’slines(A-E),usingthewordsinthebox.ThenputDavid’slinesinthecorrectorderandpractisetheconversation.asif,that,what,who,when,how,why,whose,which,whetherA.Absolutely.Youmaynotbelieveit,butthatwas________happenedattheinitialstageofourgroup'sresearchondevelopingavaccineformalaria.whatB.Yes,itis.Anditseemed_______allthetheorieswereuseful,butthefactwas_____wecouldn'tpersuadeoneanotherthatonetheorywasbetterthananother.C.Exactly.Theproblemwasnotabout________allourtheorieswereequallygood,butindeciding_______________theorytodependupon.asifthatasif,that,what,who,when,how,why,whose,which,whetherwhich/what/whosewhetherD.Werealisedthatwhatwecaredaboutwasnot___________aspectweneededtodevelopatheoryin,butrather______wecanreducethecostofavaccinewithoutreducingitseffect!E.You'reright.Atlast,webecamefocusedonthekeyissue,whichwas______wehadtocarryouttheresearchinthefirstplace.which/whathowasif,that,what,who,when,how,why,whose,which,whetherwhyExtendedtraining单句语法填空1.

He

went

to

the

hospital

for

a

medical

examination.

And

that

is_______he

was

absent

from

the

meeting.why2.

The

reason

why

she

preferred

city

life

is______she

can

have