Salaah

Q: I went to Durban for 17 days. I read qasar salaah for the first 7 days. When I realized my mistake, I read full salaah for the next 10 days. How do I correct the salaah of the 7 days?

Q: If a person prays 4 rakaats nafl with one salam, do you have to recite thana in the 3rd rakaat?

Q: Do we pray Salatul Duha in pairs of 2 or 4 rakaats with one salam?

Q: I heard that if one reads the last few aayats of Surah al Kahf and makes a niyyat to get up for tahajjud then it will be easy to get up. Is this true?

Q: How do I perform sadjah sahw?

Q:

1. I have a lot of qadha salaah and I don't know exactly how much, how should I calculate all my salaah?

2. While performing my qadha salaah, can I perform all the Fajr, then all the Zuhr, then all the Asr and so on?

Q: When a baby is born then a male Muslim calls out the complete azaan in the right ear of the baby the iqamah in the left ear of the baby.

If a person calls out the azaan in both the ears of the baby instead of azaan in the right ear and iqamah in the left ear, then what does our Islam say about this mistake?

Q: If fajar azan is at 4:45 am then what's the maximum last time tahajjud can be offered?

Q: My question is about tahajjud...

My mother often, not regularly, wakes up for tahajjud and offers tahajjud namaaz as she cannot do so due to her health. She offers it regularly in Ramadhaan, Shawwal, Muharram and Zil Hajj, etc. (special months). Me and my sister also offer tahajjud daily Alhamdulillah.

Recently, one of my relatives told my mother that if you have started offering tahajjud namaaz or if you offered it one day, you cannot quit it. It becomes fardh for you. I told my mother that this is baseless since a nafal namaz cannot become fardh but she wants to confirm it. Please clarify this according to the Ahle-e-sunnat sect. 

Q: I am a Sunni Muslim and we pray different to Shia Muslims.

My question is, how should I pray with jamaat when I visit Karbala. Can you please put some light on this.