One day, I was teaching this kid English. We were talking about using "which" in different sentences.
Then It came to using which with Inanimate objects and while we were discussing about it, he asked me why can't we can't form a question like this:
"Which train does go to Boston
Not being able to answer the question, I just put it off which I didn't want to.
Now I feel bad and don't want to leave any bad impression. I know this is how such questions are formed but I am not aware why we can not add auxiliary verb Does
So why we never ask such questions this way?