Prostration is the Sunnah

Is it right to pray nafil salah for thankfulness or just prostration is allowed?

Prayer | March 26, 2014 4:50 pm
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After Asar salah can read Nafil or Sunnah salah …I have confusion about this can you please Can you please replay me can we offer nafil salah after ASAR..
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Is it right to pray nafil salah for some work…in hopes the work will become easy (salaat ul hajaat)