Two-part connectors, or Zweiteilige Konnektoren, never appear alone; they split across two inseparable halves, where the first half signals that the second is coming, and neither can be dropped or swapped for another connector. Their core function is to link two grammatically parallel elements — whether full clauses, single words, or phrases within the same sentence — giving the style a logical precision that simple connectors cannot match.
sowohl...als auch expresses a positive combination of two elements, both being true or present at once, corresponding to 'both... and.' weder...noch is its exact opposite: it negates both elements simultaneously and already carries negation within itself, so it never needs an additional nicht or kein in the same clause — doing so would produce an unacceptable double negative. entweder...oder expresses an exclusive choice between two alternatives with no third option, and it has the distinctive property that when a sentence actually opens with entweder, it triggers inversion — the conjugated verb comes directly before the subject, as in Entweder kommst du mit, oder ich gehe allein (Either you come along, or I go alone).
nicht nur...sondern auch adds information beyond what's expected, showing that something isn't limited to the first element but extends to a second, often surprising one, usually with a note of emphasis. zwar...aber serves a different purpose: the speaker concedes a fact in the first half, then counters it with a reservation in the second — a staple of argumentative writing and opinion pieces, since it shows balance before a final judgment.
Most of these connectors keep normal word order, except weder and entweder when they open the sentence, where the order becomes: opening element, then verb, then subject. Unlike subordinating connectors such as weil or dass, two-part connectors do not push the verb to the end of the second clause, since they link two equal units rather than a main clause and a subordinate one.
The most common mistake is adding nicht or kein inside a clause that already contains weder...noch, producing the incorrect Er hat weder kein Geld noch keine Zeit instead of the correct Er hat weder Geld noch Zeit, since weder...noch already carries full negation and needs no extra negating word.