Jamaat Salaah and Imaamat

Q: Why is it not permissible to pray behind a shia jamaath even when they do believe in Allah?

Q: Should a person recite faatiha if he joins the Imaam in the third and forth rakaat?

Q: I am a follower of the Shaafi'i mazhab. In our musjid, which is mainly Shaafi'i the Somalian brothers will join a masbooq who has missed a few raka'ats and they will then follow the masbooq as if he is the Imaam.

1. Is this correct? If yes how should it be done.

2. What should you do if you are the masbooq and someone taps your shoulder or just joins your Salaah to follow you? Your input in this regard is greatly appreciated.

Q: Is there additional sawaab for performing nafl and nazr Salaah with Jamaat?

Q: Is it permissible for a person performing Nazar Salaah to follow a person offering Fardh Salah?

Q: If a person standing in the first saff commenced the Salaah with the Imaam. During the Salaah, his wudhu broke and therefore he left to perform wudhu and make bina of his Salaah. After returning, if he stood in the back saff, will he receive the reward of the first saff?

Q: Mufti sahab, I joined the imam in congregation salaah while the imaam was in ruku and I didn't get time to say subhana rabbiyal azeem? Did I get that rakaat? When does a person get the rakaat?

Q: If some people enter a Musjid after the first jamaat is over, is it permissible for them to make a second jamaat in the sehn of the Musjid or should they perform their Salaah individually in the Musjid or the sehn of the Musjid?

Q: In hanafi fiqh, if for e.g. in dhuhr salah I enter the salah in the 2nd rakat. i.e. I have to pray one rakah after the imam's salah is over, so in the aakhiri qa'ida with the Imam, I have to recite only Tashahhud or Tashahhud and durood shareef?

Q: Can you please explain to me the method of namaaz if I miss 1, 2 or 3 rakaats with jamaat?