Unit 13 Were trying to save the earth! 第四课时 Section B (1a 1e) Recycling paper is really easy.循环利用纸真的很容易。 I agree.But its hard to stop riding in cars.我同意你的观点,但是停止开车很难。 recycle作动词,意为 “ 再循环,回收利用 ” 。前缀 re表示重复,意为 “ 又,再 ” 。 eg: repeat重复 reuse重新使用 recycling paper是动词 ing形式短语作主语,其后的谓语用单数形式。该句可以改写为 “ Its really easy to recycle paper.” 。 句中 it为形式主语, to stop riding in cars是动词不定式短语作真正的主语。 stop doing sth.意为 “ 停止做某事 ” ;而 stop to do sth.意为 “ 停下正在做的事去做另 外一件事 ” 。 eg: The baby stopped crying as soon as he saw his