ANSWER:

No problem in reciting another surah after fateha in the 3rd and 4th rakah, even intentionally. There’s no sujood as sahu for this as it’s not a mistake. 

If a person unitentionally recite a surah after alfatiha in the 3rd or 4th rakah should one do sujda sahoo .

Prayer | December 24, 2018 8:58 am
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sheikh In kolkata(India) on entering evry masjid ppl wear the kufi for congreg. Salah & they take it off on leaving the masjid..one day I prayed without topi knowng that its bidah wht theyr doing..then i was the odd one out.Prophet(SAW) said dont stand out from a crowd..so i also started wearing.wht shud i do? Wear or not(then ill be only on praying bareheaded )&stand out frm rest
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With regards to yawning, since it comes from Satan, is it a sin to do? Sometimes I’m not able to control it. Also, do we have to cover our mouths if we do it OUTSIDE of prayer? And does it matter if we use our hands, or our fists to cover our mouths? Thank you for your time!