You have to pay attention to the last vowel of the word, to which you are going to add "...misin/...musun". If this wovel is (a) or (ı), you should use "mısınız?" If this wovel is (e) or (i), you should use "misiniz?" If this wovel is (o) or (u), you should use "musunuz?" If this wovel is (ö) or (ü), you should use "müsünüz?" yap-A-r mısınız sev-E-r misiniz tan-I-r mısınız bil-İ-r misiniz geliy-O-r musunuz (i couldnt find an example with Ö) ok-U-r musunuz götür-Ü-r müsünüz and so on...

they r nice answers and enough

It guess it's about Turkish vowel harmony. If a word has back vowel in its first syllable, the others must be back vowel, too. And if a word has front vowel in its first syllable the others must be front vowel. See the examples. Yapar mısınız? Sever misiniz? Mutlu musunuz?