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

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.

(2015–) Wittgenstein Source Bergen Nachlass Edition (WS-BNE). Edited by the Wittgenstein Archives at the University of Bergen under the direction of Alois Pichler. In: Wittgenstein Source, curated by Alois Pichler (2009–) and Joseph Wang-Kathrein (2020–). (N) Bergen: WAB.