Word order in the present tense
The separable prefix stands in the final position in a clause. It is thus separated from the conjugated form of its verb in a main clause, including questions. Look at the following examples:
But in a subordinate clause, the finite verb rejoins the prefix in final position and is written together with as one word. Remember that the separable prefix is always stressed in these contexts:
Wer weiß, ob er in München aussteigt?
(Who knows if he's getting off the train in Munich?)
Sie glauben, dass das Konzert um neunzehn Uhr dreißig anfängt.
(They think that the concert starts at 7.30pm.)
Wir sehen uns den Film an, obwohl wir wohl erst um neun Uhr ankommen.
(We'll watch the film although we'll probably only arrive at nine o'clock.)