I know you can't talk during פסוקי דזמרה, and certainly not during ברכות קריאת שמע. What about between them? And if not talking, what about דברי תורה?
O Ch 53 (3) MB  says that after an individual finishes the פסוקי דזמרה he should go straight on and say ישתבח and not wait for the chazzan. On Shabbos or Yom Tov, is it permitted to stop and ...
I am in high school and in the morning my principal makes announcements before אשרי at the end of שחרית. The announcements often have absolutely nothing to do with davening. For example, he will tell ...