What do I do if I miss shachris? Do I daven 2 shemona esrei’s by mincha, or is that on sometimes and can i still daven shachris if its before chatzos?
If you miss shacharis (past the fourth hour–sha’a zemanis–of the day), you should daven 2 mincha’s–first the minchah shemoneh esrei, and then the shacharis shemoneh esrei. According to some poskim you can daven b’dieved until chatzos.
Sources: Shulchan Aruch and Mishnah Berurah, Orach Chaim 108.