用以修饰名词，表示事物的特征的词。e.g.long,empty,cheap,hungry,etc.e.g.Heisagoodstudent.Ihavesomethingimportanttotellyou.Thetreesturngreeninspring.Wearealoneontheisland.形容词和宾语一起构成复合宾语．e.g.形容词的比较级和最高级构成词尾变化原级goodwellbadillmanymuchlittlefarold形容词原级的常用句型否定notas+形容词原形+as“和…不一样”或notso+形容词原形+as“不及／不如…比较级+than…表示两者之间的选择，可使用“Whichis+比较级，…or…?”Thistruckisbigenoughtocarry5tons.“The+比较级…，the+比较级…”…oneofthe+最高级+名词复数B.形容词的构成1.Helooked________becausehedidn’tpasstheexam.(happy)2.Itis________toshoutattheoldpeople.(polite)用来修饰动词、形容词、其它副词、全句或名词词组及句子的词。e.g.Scientistsareworriedthatsomethingintheairmayleadtovariousdiseasesincludinglungcancer.ShiYuankai,oneofthefamousdoctorsinShanghai,saidlongtimestayintheharmfulairtheairwithsomethingsmallerthan2.5micrometers(PM2.5)whichgoestothelungs,isamajorhealththreat.Airqualityinthecapitalisbadbecauseoftheheavyfog.Beijing’sairwaswidelypollutedonMonday,accordingtotheChinaNationalEnvironmentalControllingCenter.InBeijing,thelungcancerratehasincreasedfastduringthepastfewyears.Increasingairpollutionmightbeblamed(v.把……归咎于)fortheuseofcars.Worsely,protectivewayslikewearingfacemaskshelpbecausethedustissmall.1.修饰动词ShiYuankai,oneofthefamousdoctorsinShanghai,saidlongtimestayintheharmfulairespeciallytheairwithsomethingsmallerthan2.5micrometers(PM2.5)whichgoesdirectlytothelungs,isamajorhealththreat.Beijing’sairwaswidelypollutedonMonday,accordingtotheChinaNationalEnvironmentalControllingCenter.Worse,protectivewayslikewearingfacemaskshardlyhelpbecausethedustistoosmall.InBeijing,thelungcancerratehasincreasedquitefastduringthepastfewyears.Scientistsarereallyworriedthatsomethingintheairmayleadtovariousdiseasesincludinglungcancer.Airqualityinthecapitalisverybadbecauseoftheheavyfog.Worse,protectivewayslikewearingfacemaskshardlyhelpbecausethedustistoosmall.ShiYuankai,oneofthefamousdoctorsinShanghai,saidlongtimestayintheharmfulairespeciallytheairwithsomethingsmallerthan2.5micrometers(PM2.5)whichgoesdirectlytothelungs,isamajorhealththreat.Worse,prot