Syllables which ended with -t, though being represented by "ti" or "tu," were represented only by "t" in Christian materials, so it is considered that such syllables either accompanied vowels/i/ and/u/ or were realized as [t], but some theories insist otherwise.
tで終わる音節は「チ」「ツ」と表記されるが、キリシタン資料では主にtのみで書かれることから、母音/i/,/u/を伴うものと、[t]のままで実現する場合があったと考えられているが、異説もある。