whether引导是名词性从句主句不缺成分？

Question

People are influenced by advertisements when choosing what to buy whether they are conscious of it or not.
因为主句完整所以我分析这个when是引导状语从句的
但是状语从句when choosing what to buy 好像也要主谓完整吧，找不到主语= =
然后同学就说 they are被省略掉了，我想好像是，但是

People are influenced by advertisements when they are choosing what to buy 是没问题了
,但是这后面的whether不是名词性从句吗，那前面主句应该缺个成分才行啊

Answer 1

这里whether引导的是让步状语从句。具体分析如下：

People 是主语are influenced 是谓语by advertisements 是状语when choosing what to buy 是带连词的现在分词短语作状语，相当于一个状语从句，但不是从句，也不属于省略的问题。短语作状语与从句作状语是两个概念，不可混为一谈。当状语从句的主语与主句的主语一致时，可以用连词加分词代替状语从句。whether they are conscious of it or not.根据意思判断是让步状语从句，修饰主句中的谓语。不是名词性从句。whether引导状语从句时也不作句子成分。

Answer 2

句子缺少成分时经常会用what,它是指主句和从句都缺少成分，举例解释
Many workers were organized to clear away what remained of the World Trade Center.
翻译：许多工人被组织去清理世贸中心的残留物。
句子成分：Many workers 是主语，were organzized to clear away 是谓语，what 引导的宾语从句，这是名词性从句的考察，而且what在从句中作主语。此处what="the" thing（s）that，引导名词性从句，且在从句中作主语。因为clear away缺少宾语,后面从句缺少主语,中间用what连。
类似举例：
He didn't get what he wanted.
I will tell you what I know.
This is what I bought yesterday.
拓展
what作关系代词时,其含意是“所…的事(物)”。可用来引导主语从句,表语从句,宾语从句或同位语从句。当引导主语从句,其所指的名词必定是单数。主语是单数时,谓语动词一般是单数,但有时因谓语动词之后有复数名词,谓语动词也可用复数; what引导宾语从句时,常置于谓语之后,用作表语时,放在系动词之后。what还可引导让步状语从句,意思是“不管…”。还可接动词不定式短语。

Answer 3

whether 可以引导名词从句（是否……）和让步状语从句（不管……还是……）。

Answer 4

whether引导的从句主谓宾等之类不缺，但whether 要在从句中作状语追问

你好，从句不缺成分的，可是主句People are influenced by advertisements when choosing what to buy。这一部分应该缺个名词不是吗？

追答

when they are choosing what to buy. (they are )省略了。

其它成分不缺

what to buy 相当于what they should