托福写作中常用的状语从句有以下几种：

　　原因状语从句：常由because， as， since和for引导。

　　例如：Nonetheless, I am still in favor of space travel, for it has brought us many benefits.

　　时间状语从句：常由when和while引导。

　　例如：When I was young, I preferred to stay at home rather than going out.

　　条件状语从句：常由if和unless引导。

　　例如：If you want to succeed, you should work hard.

　　让步状语从句：常由although和though引导。

　　例如：Although I am in favor of space travel, I think it should be done carefully and safely.

　　地点状语从句：常由where和wherever引导。

　　例如：Wherever there is a will, there is a way.

　　方式状语从句：常由as和as if引导。

　　例如：We should do everything as if we are doing it for ourselves.

　　希望以上信息对您有所帮助。