Does the person Should we say that the person … who has not learnt the language know◇s wh 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 wheter he

makes a sound or not
cries out or not

. Then surely it would interest us if the subject ◇◇◇

often when we
whenever we

stung him saw, say, a red [|c]ircle. 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

seems to be nothing problematic in it.
is no problem about 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.