Wie kann ich dich sehen? deutlich --> also 'clearly'

But it still has to be 'clearly' (adverb modifying the verb 'see' -- how do you see?), so it would theoretically have to be 'crystally clearly'? But I think you're right that no one would ever say that.

I suspect that MikeE or others better versed in modern linguistics would say that just 'crystal clear' is also possible, because the underlying thought is that "you" = "clear," which transforms the grammar into something more resembling an adjective complement after a linking verb.

People can and do certainly say things like 'I saw him clear as day,' which you could probably explain as 'I saw him (and he was / looked / appeared) clear as day.'

#3: Dein Beispiel "I feel bad" ist eine andere Kategorie. feel look smell sound taste sind die "sense verbs", die mit Adjektiv verwendet werden: "The song sounds great", "he looks good" usw. Die Adjektive benennen die Qualität des Subjekts, sie qualifizieren nicht das Verb.

Sogenannte flat adverbs , d.h. Adverbien, die dieselbe Form haben wie die dazugehörigen Adjektive, obwohl es auch eine "ly"-Variante gibt, sind in der Welt der englischen Muttersprachler gängiger als sich das so mancher deutsche Grammatikpurist so denkt.

Vielen Dank für die interessanten Beiträge. Eine Frage an Raudona:

The basic answer is still that it should be 'I can see you very clearly.' Nothing has changed from #1, and 'I can see clearly now the rain is gone' is still a good example to remember.

There are other contexts where 'clear' might be used with an additional phrase, like 'as clear as day,' or indeed possibly 'as clear as crystal,' but those are exceptions.

The more I think about it, though, the less satisfied I am with the explanation I tried to make in the second part of #5. Whatever the reason for the occasional exceptions, that may not be it.

And, while this is too much for the original poster, those of you who are more advanced may need to be aware that 'see someone clear' has a different meaning: roughly, get someone past an obstacle, allow someone to get out of trouble. Example: Bayern were so close to getting the one more goal that would have seen them clear. *sniff*

I see you crystal clear is, strictly speaking, ungrammatical because, as noted above, clear is here used as an adverb.