Because I’ve previously studied a lot about “wh-movement,” I’ve developed at least a basic understanding of wh-words. However, today I came across the following expression on a language exchange platform, and after thinking about it, I found myself thoroughly confused:
1.1 What color do you like?
My personal understanding of “what” is that it should be used when you have absolutely no knowledge about the object of your question—for example:
1.2 What do you like?
In this case, regarding the verb “like,” we truly know nothing about its object.
But in the sentence “What color do you like?”, we already know one piece of information about the object of “like”—namely, that it’s a “color.” In other words, our answer will be selected from the set of all possible colors. Therefore, I feel that “which” should be used here instead of “what.”