Method of Salaah

Not reciting Surah Faatihah in the third and fourth rakaat of a fardh salaah

Q:

1. If a person intentionally does not recite Surah Faatiha in the third or fourth rakaat of a fard salaah but stands for the duration of three subhanallahs or more and then goes into ruku, will that person’s salaah be valid or invalid? Also, if that person stands for less than the duration of three subhanallahs and then goes into ruku, will that person’s salaah be valid or invalid?

2. If a person forgets to recite Surah Faatiha in the third or fourth rakaat of a fard salaah but stands for the duration of three subhanallahs or more and then goes into ruku, will that person’s salaah be valid or invalid? Also, if that person stands for less than the duration of three subhanallahs and then goes into ruku, will that person’s salaah be valid or invalid?

Forgetting to sit for the last qa'dah in a four rakaat fardh salaah

Q: A person was performing a four rakaat fardh salaah. After performing the fourth rakaat, he did not sit for the qa'dah, but forgetfully stood up for the fifth rakaat. He then made ruku and sajdah in the fifth rakaat, sat for tashahhud and made salaam.

What is the status of his salaah? Is his fardh salaah valid or does he have to repeat his salaah?

When should the tasmee and tahmeed be recited?

Q: 

1. I am a student of deen. I wish to know whether the imaam and muqtadee should recite tahmeed in salaah? If they should recite it, then when should they recite it? Should they recite it while rising from ruku or while standing in qaumah? I have heard that there is a difference of opinion in the Hanafi Mazhab in regard to this mas’alah.

2. Should the munfarid recite tasmee and tahmeed or only tahmeed?

When should the tasmee and tahmeed be recited?

Q: I was always of the impression that the muqtadee should recite tahmeed in qaumah after the imaam completes reciting tasmee. However, I was lately informed by certain Ulama that the muqtadee should recite tahmeed at the same time that the imaam recites tasmee. I would like to know whether this is correct? I also wish to know whether all my past salaah are valid since I have always been reciting tahmeed in qaumah after the imaam completed reciting tasmee.