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1.形容词原级的用法
形容词的原级常用于“as…as”及“not as(so) …as”两种句型中。
1）.句型“as…as”，表示两者相比较，程度相同。例如：
The old man walks as fast as a young man.这位老人走路与青年人一样快。
Science is as important as maths.自然科学与数学一样重要。
This coat is as expensive as that one.这件上衣与那件一样贵。
2）.句型“not as(so) …as”，表示两者相比较，程度不一样。例如：
I’m not as tall as Jack. 我不如杰克高。
She doesn’t run so fast as I. 她不如我跑得块。
This warship is not so big as that one.这条军舰不如那条大。
同级比较歌诀
同级比较用原级，as…as不分离；若是否定加not，as…as否前者。
as…as加not，只说两者有区别。so…as加not，后者总是强前者。
3）.在使用“as…as”与“not as(so) …as” 句型，应该特别注意“as…as”或“not as(so) …as”中间的形容词必须是形容词的原级。例如：
（正）Today is as warm as yesterday.（误）Today is as warmer as yesterday.
（正）I’m not so careful as my brother.（误）I’m not so more careful as my brother.
4）.需要注意的原级形容词用法：
①“数词＋times+as+形容词原级＋as”（是……的几倍）。例如：
This tree is twice as short as that one.这棵树比那棵树矮两倍。
My scores are three times as many as yours.我的比分是你的三倍。
This road is four times as wide as that one.这条马路的宽度是那条的四倍。
②“half+as+形容词原级＋as”（……的一半……）。例如：
My English is not half as good as yours.我的英语不如你的一半好。
This town is half as big as ours.这个城镇有我们的城镇一半大。
The rivers in the north aren’t half as many as those in the south. 北方的河流不如南方的一半多。
③“as…as”结构中，若形容词作定语修饰可数名词单数，不定冠词a(an)应置于形容词与名词之间。例如：
English is as important a subject as maths.英语和数学是同样重要的一门学科。
Uncle Wang is as good a man as my father.王叔叔是与我父亲同样好的一个人。
This is as famous a school as ours.这是一所与我们学校同样著名的学校。
④“as…as”结构若指同一个人或物，则并无比较意义，而只是说明某人或某物具有两种性质。译为“又……又……”或“不但……而且……”。例如：
This computer is as good as it is cheap.这台电脑质量又好又便宜。
The boy is as strong as he is brave.这个男孩又健壮又勇敢。
The city of Suzhou is as beautiful as it is clean.苏州城既美丽又干净。
2.形容词的比较等级的构成 略
3.形容词的比较级的用法
1)表示两者之间比较时，用“形容词比较级＋than”或“less……than”两种句型。例如：
Your mother looks healthier than before.你妈妈看上去比以前健康了。
I’m less interested in basketball than you.我对篮球的兴趣不如你大。
2）.形容词的比较级还可以用于以下句型中。
①more and more……（越来越……）。例如：
The park is getting more and more beautiful.这个公园变得越来越美了。
China had become stronger and stronger.中国已变得越来越强大了。
②the more……the……(越……就越……)。例如：
The more books we read, the cleverer we will become. 我们读的书越多，就会变得越聪明。
The more trees, the better. 树越多越好。
The sooner, the better. 越早越好。
The more exercise we take, the healthier we are.我们越锻炼，身体就越健康。
③“the＋比较级＋of the two……(两个中较……的一个)”。例如：
I’d like to go to the farther of the two places.两个地方相比较，我愿意去更远的一个。
She is the fatter of the two girls.她是那两个女孩中较胖的一个。
④“比较级＋than any other+单数名词（比其他任何……都……）”。例如：
Li lei is taller than any other boy in his class.
李雷比他班上任何一个男孩都高。（暗指：李雷最高）
The population of China is larger than any other’s in the world.
中国的人口比世界上任何国家的人口都多。（暗指：中国人口最多）
3）.形容词的比较级前还可以用much,a lot, far, even, still, a little, no, any等表示程度的词来修饰。例如：
I feel a little better than yesterday.我感觉比昨天好一点儿了。
The job is far more difficult than before.这工作比以前要难得多。
4.形容词的最高级的用法
1)三者或三者以上相比较用“the＋最高级＋名词＋范围”。例如：
This is the cleanest place of the city.这是这个城市最清洁的地方。
Hu Yun is the fastest of all the girls in our class.胡云是我们女生中跑得最快的。
2）.表示“最……之一”，用“one of the+形容词最高级＋复数名词”。例如：
The Great Wall of China is one of the greatest buildings in the world.中国的长城是世界上最伟大的建筑之一。
This is one of the most interesting books that Ive ever read.这是我读过的最有趣的书之一。
注意. 形容词的最高级前面必须加定冠词the，但当形容词最高级前面有物主代词修饰时，则不加the。 例如：
（正）This is my best friend.
（误）This is my the(the my) best friend.
（正）Today is the happiest day of my life.
（误）Today is happiest day of my life.
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