这里 whether 从句是同位语从句,对主语people 做进一步说明。
Whether the result is favorable or not, you should speak the truth.这个句子里whether 从句是条件状语从句。
whether用于表语从句:The question is whether we can finish our work by tomorrow evening.
whether用于宾语从句: It all depends on whether we can get their cooperation.
whether用于主语从句: Whether I knew John doesn't matter .
状语从句是修饰谓语的句子,定语从句是起修饰限制作用的,可以用来修饰主语,定语,宾语或表语;宾语从句是作介词或动词的宾语的。