重点短语 重点句型 重点单词 ❷倍数表达法 Using his hybrid rice,farmers are producing harvests twice as large as before.用他的杂交水稻(种子),农民们种出的粮食比以前多了一倍。(教材原句P10) 表达倍数的常见句式如下: 1.倍数+as+形容词/副词的原级+as... This river is twice as long as that one.这条河是那条河的两倍长。 2.倍数+形容词/副词的比较级+than... The car runs twice faster than that truck.这辆小车的速度比那辆卡车快两倍。 3.倍数+the size/height/length/depth...+of... This mountain is four times the height of that hill.这座山的高度是那座小山的四倍。
重点短语 重点句型 重点单词 4.形容词/副词的比较级+than...+by+倍数 The line is longer than that one by twice.这条线是那条线的两倍长。 ◆现学活用 单句改错 1.After the new technique was introduced,the factory produced tractors in 1988 twice many as the year before.(在many前加as) 2.The earth is 49 times size of the moon.(在size前加the)
重点短语 重点句型 重点单词 ❸have been doing 现在完成进行时 Recently,however,scientists have been finding that long-term use of these fertilizers can cause damage to the land and,even more dangerous,to people’s health.然而,最近科学家发现长期使用这些肥料会造成土地受损,甚至更危险的是,会对人们的健康造成危害。(教材原句P14) 句中的have been finding是现在完成进行时,表示动作从过去某个时间开始,一直持续到现在,并将持续下去。 The Chinese have been making paper for two thousand years.中国有2000年的造纸历史。 I have been writing a book.我一直在写一本书。
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