Thank you Lily, and i wanna kno, when i must use つ before a letter? normally when there is a double letter, i use this letter right?(Romaji) Hi Ivan! you don't need to add つ before a letter.（ わたしは Ivan でつす）　です without つ. parce que you use Romaji substitute for katakana. When you want to typewrite katakana [です] you ought to typewrite {desu} in a japanese keyboard.