als, wenn, wann, bevor, nachdem

Time conjunctions start a subordinate clause, so the conjugated verb goes to the end.

• als: a single event or period in the past (als ich zehn war)
• wenn: the present or future, and repeated events in the past (immer wenn, jedes Mal wenn)
• wann: the question word, also in indirect questions (Weißt du, wann ...?)
• bevor / ehe: before
• nachdem: after; its clause is one tense further back (Plusquamperfekt with a past main clause)
• während: while, and also for a contrast
• seit / seitdem: since, for something that is still true now
• bis: until

Tip: in the past, als is for one time and wenn for every time.