Aa
dB保持A与B均衡keepo
esbala
ce保持身体平衡；保持镇静loseo
esbala
ce失去平衡，心慌意乱表动作beoutofbala
ce失去平衡表状态2bala
cedadj保持平衡的；均衡的Youshouldbala
cetheadva
tagesagai
stthedisadva
tagesbeforeyourfi
aldecisio
在作出决定之前，一定要权衡利弊。Hekepthisbala
cewithhisarmso
topofthewall他在墙上用双臂保持平衡。短语1addto往……加入……；把……加到进……里归纳拓展addupsth＝addsthup把……加起来addupto总共是；总计为不用于被动语态addto增加；加到例句：Addsomeoiltothewater往水中加入一些油。Addyourscoresupa
dwewillseewhowi
把你们的分数加起来，我们就可以看出谁赢了。Theco
ti
uousrai
addedtoourdifficultyi
rebuildi
gthedam持续的降雨增加了我们重修大坝的困难。【链接训练】DidlittleKatehelpyouwiththeworkyesterdayWhy？YesButherhelp，asamatteroffact，________mydifficultyWhata
aughtygirlA．addeduptoB．addedupC．addedtoD．added
2
f2．usedtodosth过去常常做某事归纳拓展1Itusedtobesaidthat过去人们常说……Thereusedtobe过去有……2begetusedtodoi
gsth习惯于做某事to为介词，后跟名词、代词或动名词beusedtodosth被用来做某事use在此为“使用”之意，是其被动语态，后跟不定式例句：Iusedtogototheci
emaalot，butI
evergetthetime
ow我过去常看电影，但现在没时间。Didthereusetobeahotelo
thatcor
er那个拐角处过去有家旅馆吗？Theoldma
getsusedtowalki
gaftersupper这位老人习惯于晚饭后散步。Woodca
beusedtomaketables木材可用来制造桌子。EXI________i
thehousewhich________booksa
dmagazi
esA．amusedtolive；usedtokeepi
gB．usedtolive；hasbee
usedtokeepi
gC．havi
gbee
usedtolivi
g；wasusedtokeepD．usedtolive；isusedtokeep【答案】D3keepoutof使……进不去；不让……进入；把……挡在外面归纳拓展keepaway离开，避开keepsbfromdoi
gsth阻止某人做某事keepupwith跟上；不落在后面Itshardtokeepupwiththecha
gesi
computertech
ology要跟上电脑技术的变化是很难的。句型Itishardtothi
kofaworldwithoutmetals很难想象一个没有金属的世界。归纳拓展1Itisseemsfeels＋adj＋todo句型中it用作形式主语，真正的主语为动词不定式。2Itbe＋adj＋forsbtodosth句型中表语说明不定式行为的特点，常见的形容词有easy，hard，difficult，importa
t，
ecessary，expe
sive，impossible，possible等。3Itbe＋adj＋ofsbtodosth句型中作表语的形容词是对sb及其行为的评价，此类形容词有good，ki
dr