usmuchharm．3）Itisharmfultous．例：However，everythi
gdividesi
totwo．Televisio
ca
alsobeharmfultous．Itca
doharmtoourhealtha
dmakeuslazyifwespe
dtoomuchtimewatchi
gtelevisio
．4．表示重要、必要、困难、方便、可能1）Itisimporta
t（
ecessary，difficult，co
ve
ie
t，possible）forsb．todosth．2）Wethi
kit
ecessarytodosth．
f学习必备
欢迎下载
3）Itplaysa
importa
trolei
ourlife．例：Computersare
owbei
gusedeverywhere，whetheri
thegover
me
t，i
schoolsori
busi
ess．Soo
，computerswillbefou
di
everyhome，too．Wehavegoodreaso
tosaythatcomputersareplayi
ga
i
creasi
glyimporta
trolei
ourlifea
dwehavesteppedi
totheComputerAge．5．表示措施1）Weshouldtakesomeeffectivemeasures．2）Weshouldtryourbesttoovercome（co
quer）thedifficulties．3）Weshoulddoourutmosti
doi
gsth．4）Weshouldsolvetheproblemsthatweareco
fro
ted（faced）with．例：Thehousi
gproblemthatweareco
fro
tedwithisbecomi
gmorea
dmoreserious．Therefore，wemusttakesomeeffectivemeasurestosolveit．6．表示变化1）Somecha
geshavetake
placei
thepastfiveyears．2）Agreatcha
gewillcertai
lybeproducedi
theworld’scommu
icatio
s．3）Thecomputerhasbroughtabout（导致）ma
ycha
gesi
educatio
．例：Somecha
geshavetake
placei
people’sdieti
thepastfiveyears．Themajorreaso
sforthesecha
gesare
otfartoseek．Nowadays，morea
dmorepeopleareswitchi
gfromgrai
tomeatforprotei
，a
dfromfruita
dvegetabletomilkforvitami
s．7．表示事实、现状1）Weca
otig
orethefactthat．．．2）Noo
eca
de
ythefactthat．．．3）Thereis
ode
yi
gthefactthat．．．
4）Thisisaphe
ome
o
thatma
ypeoplearei
terestedi
．5）However，that’s
otthecase．例：Weca
otig
orethefactthati
dustrializatio
bri
gswithittheproblemsofpollutio
．Tosolve
f学习必备
欢迎下载
theseproblems，weca
startbyeducati
gthepublicaboutthehazards（危害）ofpollutio
．Thegover
me
to
itspartshouldalsodesig
stricterlawstopromoteaclea
ere
viro
me
t．
8．表示比较
1）ComparedwithA，B．．．
2）Iprefertoreadrathertha
watchTV．
3）Thereisastriki
gco
trastbetwee
them．
例：Comparedwithcars，bicycleshaveseveraladva
tagesbesidesbei
gaffordable．Firstly，theydo
otco
sume
aturalresourcesofpetrol（石油）．Seco
dly，theydo
otcausethepollutio
problem．Lastbut
otleast，theyco
tributetopeople’shealthbygivi
gthemduephysicalexercise．
9．表示数量
1）Ithasi
creased（decreased）from．．．to．．．
2）Thepopulatio
i
thiscityhas
owi
creased（decreased）to800，000．
3）TheoutputofJulyi
thisfactoryi
creasedby15％comparedwiththatofr