八年级英语Our World课件3
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八年级English(上)知识简表四----Unit 4 Our WorldTopic 1.Plants and animals are important to us.1.形容词比较级与最高级形容词adj.:是用来修饰名词的词,一般放在所修饰的名词前面说明人或事物自身的性质、特征或状态时用形容词原级:The flowers in the garden are beautiful.有表示程度的副词very,so,too,enough,quite等修饰时用形容词原级:The boy is too young.表示A与B在某一方面程度相同或不同时用形容词原级:①A+as+形容词原级+as+B:Xiao Ming is as all as Jim.②A...+not+as/so +形容词原级+as+B:This book isn't as/so new as that one. I am not so careful as Lucy.③表示“A是B的......倍”时用“A...+倍数+as+形容词原级+as+B”(1倍:once,2倍:twice,3倍及以上:数字+times):Our school is three times as big as theirs. 我们学校是他们学校的3倍大。
This table is twice as long as that one.这张桌子是那张桌子的两倍长。
④“...half af +形容词原级+as...”表示“……是……的一半”:Her room is half as big as yours.她的房间是你的房间的一半大。
形容词一般有三个等级即“原级、比较级、最高级”1.比较级与最高级的构成规则变化1)单音节词和部分双音节词加er,est:great--greater--greatest, strong--stronger--strongest,deep--deeper--deepest以e结尾加r,st:large--larger--largest, brave--braver--bravest, fine--finer--finest2)以重读闭音节结尾的词双写辅音字母再加er,est:big--bigger--biggest, hot--hotter--hottest, red--redder--reddest, sad--sadder--saddest, thin--thinner--thinnest, wet--wetter--wettest, fat--fatter--fattest3)以“辅音字母+y”结尾的词变y为i再加er,est:easy--easier--easiest, angry--angrier--angriest, busy--busier--busiest, cloudy--cloudier--cloudiest, dry--drier--driest, dirty--dirtier--dirtiest, early--earlier--earliest,happy--happier--happiest, healthy--healthier--healthiest, heavy--heavier--heaviest, hungry--hungrier--hungriest, lazy--lazier--laziest, lucky--luckier--luckiest, empty--emptier--emptiest4)more,most+大多数双音节和多音节形容词:beautiful--more beautiful--most beautiful, careful--more careful--most careful, dangerous--more dangerous--most dangerous, different--more different--most different,difficult--more difficult--most difficult, expensive--more expensive--most expensive, favourite--more favourite--most favourite, friendly--more friendly--most friendly, important--more important--most important,interesting--more interesting--most interesting, possible--more possible--most possible, serious----more serious--most serious, terrible----more terrible--most terrible, useful--more useful--most useful, wonderful--more wonderful--most wonderful比较等级变化口诀:比较级要变化,一般词尾加er。