Thisis where developing new habits comes in.
请问老师，在这个从句中，where是作in的宾语吗？可是where不是连接副词吗？那同样的，when why how等连接副词有没像where如此作介词宾语的使用方法呢？
你对come in理解错误。in在此不是介词，而是副词，和come构成不及物短语动词come in. come in有不同语义，其中之一为：to have a particular role or function 比如以下词典例句：
We're going to need someone to help with the cooking, and that's where you come in. [=your job will be to help us with the cooking]
你的句子与此类似，where为融合型关系副词，= the situation where/in which 即where把先行词和关系副词融为一体，其中关系副词在从句中作地址状语。
