Fardh and sunnah prayers must be performed separately
Question

                In making salah,do you combine Fardh and Sunnah rakahs??
Or you do one(fardh)or the other(sunnah)? 
Also, to become a Muslim,is it necessary to declare that you are a Muslim in the company 
of two other Muslims?  thank you
Praise be to Allah.al-hamdu lillaah.

Fardh and sunnah prayers have to be performed 
      separately. 


You don't need witnesses to become a 
      Muslim. Once you utter the Shahadatain believing in them, you are then a 
      Muslim. 

Please see the section on "Accepting 
  Islam & Related Issues ".