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Thanks!

[Anhra dothrok.]

I started learning Dothraki(yesterday) and  I have some questions: 

• On  wiki I found examples for negative form of present tense. But I also found "vos" statements..Is it like this:
  Anhra dothrok.   or Anhra vos dothrak? or maybe Anhra vo(s) dothrok ?
  
• 
  Also  I found that if next word starts with non-vowel (constontant I mean) you use vo insted of vos.
  
• 
  What vowels are in Dothraki language? (in serbian,vowels are  A E I O U )
  
• 
  Is this correct sentances:
  Anhra dothrak,vosma yer dothrae, kifindirgi?
  (I ride, but you do not,why?)