(3) 原因状语从句 e.g. Pets should be forbidden because they may spread diseases and damage the cityscape.(应该禁止饲养宠物，因为它们可能会传播疾病和有损市容。)

　　(4) 目的状语从句 e.g. Old people should be encouraged to live in a nursing house so that they can enjoy professional care and first-rate facilities. (应当鼓励老人到敬老院居住，这样他们可以享受到专业的照料和一流的设施。)

　　(5) 结果状语从句 e.g. Some government officials fail to recognize the potential hazards of improper waste disposal, so that the environment in some cities is deteriorating.(一些政府官员未能认识到垃圾处理不当带来的潜在危害，因此一些城市的环境不断恶化。)

　　(6) 条件状语从句 e.g. If we continue to overlook the increasing waste in Guangzhou, it is likely that Guangzhou will become a huge landfill site sooner or later.(如果我们继续无视广州日益增多的垃圾，有可能不久的将来广州将成为巨大的垃圾填埋场。)

　　(7)让步状语从句 e.g. While I admit that smoking has some side-effects, I still feel that it is ridiculous to ban smoking in public places.(虽然我承认吸烟有副作用，我依然觉得公共场所禁烟是荒唐的。)

　　(8) 比较状语从句 e.g. Red is two times as much as Blue.(红色是蓝色的两倍。)

　　(9) 方式状语从句 e.g. Just as we protect less able human beings, so we should safeguard the welfare of other weaker species.(正如我们保护弱者一样，我们也应该保护弱势物种的福利。)