Now when we are trying to say Sotto in Katakana, how can this be written in Katakana? The exact same way as Hiragana in that the example of Matto, but there is no character for just a "t". To do this, we add a small "tsu" character before the "to" to make a Ma-t-to. This rule is used for every combination except for "N" which is just a repeat of itself.
Long vowels are different in Katakana then in Hiragana. In Katakana you just add a "-" if you are continuing the same character, regardless if it is AA, II, UU, EE, or OO. It would be "A character" and "-" and so forth for the others.
