Breakdown of Мы будем репетировать новую роль, перед тем как выступать.
мы
we
новый
new
быть
to be
репетировать
to rehearse
Questions & Answers about Мы будем репетировать новую роль, перед тем как выступать.
Why do we use the infinitive выступать here instead of a future tense verb like мы будем выступать?
When the subject of the main clause and the 'before' clause is exactly the same (in this case, 'we'), Russian prefers to use an infinitive after перед тем как. You don't need to repeat the subject and conjugate the verb again.
Could I use до того как instead of перед тем как in this sentence?
Yes, they are mostly interchangeable here. However, перед тем как often implies that the first action happens immediately or right before the second one, whereas до того как is a more general 'before'.
Why is the comma placed before перед rather than before как?
With compound conjunctions like перед тем как, the comma almost always goes before the entire phrase when it comes after the main clause. You generally don't split the phrase with a comma unless you want to put special logical emphasis on the word тем.
Why is the first verb phrase будем репетировать in the imperfective aspect rather than the perfective?
Using the imperfective future будем репетировать focuses on the continuous process or duration of rehearsing. If the speaker wanted to emphasize successfully completing the rehearsal, they would use the perfective future отрепетируем.