Konjuntionen

Conjunctions can be divided into 2 groups: co-ordinating (do not affect the word order) and subordinating (force the verb to the end of the clause). Co-ordinating conjuctions include (but are not limited to) the following:

und and
aber but
oder  (entweder ... oder) or   (either ... or)
denn because
sondern but (on the contrary
bis  until
entlang along

Beispiele

For sondern to be appropriate there needs to be a negative word ( nicht, kein ) in the previous clause, and a condition contrary to the previous clause must be present.

Sondern would not be appropriate here. Instead aber is called for, because the condition in the first clause is not contrary to the condition in the second.

Subordinating Conjunctions move the verb to the end of the clause. The verb remains conjugated. In the case of separable prefix verbs the verb is reconnected to the prefix. When a modal verb occurs in the sentence, it is the modal verb that is moved to the end after the infinitive verb.

When a sentence is begun with a subordinating conjunction, the verb is moved to the end of the clause. It is followed by a comma. After the comma the next words that appears will be the verb from the next clause. Following this verb normal word order if followed.

Subordinating Conjunctions include (but are not limited to) the following:

dass that
weil because
da since, because
ob if (whether or not)
wenn if  (if ...then) and when (whenever)
als when  (with past action)  and as
obwohl  although
während while
seit / seitdem since (since the time)
nachdem after (after a prviously mentioned action)
bevor before
damit  so that