>What about these sentences?
>So was gelesen, habe ich nicht.
>Ein Buch schreiben, will ich nicht.
These are straightforward - the first idea is everything up to your comma,
so the verb is still the second idea. This is why even long and complex
subordinate clauses can come first. They function as the first idea, and
are followed by the main verb, for example:
Wenn ich in meinem Anzug schlafe, schlafe ich nut so gut.
I have seen a sentence with over 200 words before the main verb, but all
those two hundred words function together as the first idea, grossly
explanded.
>Can you give me an example of a grammatical sentence where a verbal
>particle stands as a topic?
>*An habe ich ihn gerufen.
This would have to be a very extreme situation of contrast, such as
Ein ist er gegangen, nicht aus!!!
Ein kann ich schon steigen, aus nicht!
But both are much more naturally expressed otherwise. However, the fact
that they are possible (just) and strictly speaking grammatical, may be
sufficient for the argument.
Peter