Diese Frage wurde hier auch (auf Deutsch) beantwortet:
I was doing some grammar exercises, one of which involved putting highlighted parts of a sentence at the beginning of the sentence in question, and making changes to the subsequent word order to ensure grammaticality. For instance, I was given:
Schwere Fragen waren in der Prüfung.
And in response, I wrote:
In der Prüfung waren schwere Fragen.
Now, most of these were very straightforward. However, I was unsure about the following:
Am Tag vor der Prüfung hatte die Professorin alles noch einmal zusammengefasst.
The bolded bit comes from the verb zusammenfassen, which is "to summarize", and which is separable. I was slightly confused, since this was a past-participle, and the past participle will always need to be in the final position. Thus, I wrote this down:
Zusammen hatte die Professorin am Tag vor der Prüfung alles noch eimal gefasst.
Is this correct? More generally: Are separable verbs to be broken up (even if they are originally in "unseparated" forms) if they are to be moved to the beginning of the sentence, so as to keep the "main" verb at the end? Or is the prefix generally not moved to the front of the sentence either?