由关系副词when, where, why引导的从句。例如: I would like to analyze the reasons why a growing number of teenagers are addicted to gambling.

　　副词性从句

　　副词性从句也称为状语从句，主要用来修饰主句或者主句的谓语。大致分为九大类，分别表示时间、地点、原因、目的、结果、条件、让步、比较和方式。

　　时间状语从句e.g. When everyone is fully aware of the severity of fresh water scarcity and takes effective measures, I am convinced that we will tackle this problem constructively.

　　地点状语从句e.g. Where there is smoke, there is fire.原因状语从句e.g. Pets should be forbidden because they may spread diseases and damage the cityscape.

　　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.

　　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.

　　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.

　　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.

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