Welcome to your Kitzur Quiz - Siman 070
4.
If an individual enters a shul to daven ma'ariv (before tzais) and finds the congregation already davening the sh'moneh esrei of ma'ariv, what should he do (in a situation where he wont be able to daven with a minyan later)?
5.
If one enters a shul to daven ma'ariv before tzais, and finds the congregation saying "V'emuna kol zos v'kayam aleinu....", what could he do?