Does the person who has not learnt language know| Should we say that the person who has not learnt the language knows that he sees red but can't express it?— Or should we say: “he knows what he sees but can't express it”?— So besides seeing it he also knows what he sees?
     Imagine we described a totally different experiment; say this, that I sting someone with a needle & observe whether he cries out or not| makes a sound or not. Then surely it would interest us if the subject

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whenever we| often when we stung him saw, say, a red circle. And we would distinguish the case when he cried out & saw a circle from the case when he cried out & didn't see one.
     This case is quite straightforward & there is no problem about it.| seems to be nothing problematic in it.