Jedoch in the sense of however can be used either as a coordinate conjunction which does not affect the word order in a sentence or as an adverb which may affect the word order in a sentence. I am wondering when it should be used as a coordinate conjunction and when as an adverb. Does it depend on the context of meaning? And how does it depend on the context of meaning?
The following examples are quoted from Langenscheidt Großwörterbuch Deutsch als Fremdsprache:
Examples for jedoch as a coordinate conjunction:
i) Die Polizei suchte ihn überall, fand ihn jedoch nicht.
ii) Die Polizei suchte ihn überall, jedoch sie fand ihn nicht.
As for example i), I am wondering why the coordinate conjunction jedoch is allowed to be positioned in the middle field of the clause it introduces? I presume coordinate conjunctions should always precede the whole clause.
As for example ii), I am wondering whether the subject sie of the consequent clause may be omitted so that the consequent clause becomes jedoch fand ihn nicht.
An example for jedoch as an adverb:
Wie es weitergeht, weiß niemand genau, es gilt jedoch als sicher, dass der Minister zurücktreten wird.
I am wondering why jedoch is recognized as an adverb in this example but as a coordinate conjunction in previous examples. Could anyone help explain this?