The answer is:
- where: Place.
- as soon as: Time.
- because: Reason.
- If: Condition.
- so (that): Purpose.
- than: Comparison.
Subordinating conjunctions join two clauses, a main one (or independent clause, which can stand on its own) and a subordinate clause (or dependent, which does not indicate a complete thought on its own). They also provide a trasition between the two clauses in order to express time, place, or cause and effect.