"Respondezzing s'il vous plait" is a phrase commonly used to request a response to an invitation or inquiry. However, there are several synonyms that can be used in place of this phrase, such as "RSVP", "reply requested", "please respond", and "kindly reply". These synonyms are commonly seen on formal invitations, emails, and event announcements. In today's digital age, more casual language can also be used, such as "let us know", "give us a heads up", or "can't wait to hear back". Regardless of the language used, the important thing is to clearly communicate the need for a response to avoid confusion or potential misunderstandings.