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Long Vowel and Double Consonant
Long Vowel
Long vowels in Katakana are indicated by adding the mark "ー" regardless of the proceeding vowel, while long vowels in Hiragana are expressed by adding あ, い or う(sometimes え or お is used) according to the proceeding vowel;
| column | mark that is added | example |
|---|---|---|
| all columns | ー | カード(card) |
| kaado | ||
| キー(key) | ||
| kii | ||
| スーツ(suit) | ||
| suutsu | ||
| ケーキ(cake) | ||
| keeki | ||
| コート(coat) | ||
| kooto |
The mark is written horizontally when the word or sentence is written horizontally, while the mark is vertically ("｜") when the word or sentence is written horizontally.
Double Consonant
The sounds of Katakana containing double consonants are same as Hiragana containing double consonants;
| consonant | example |
|---|---|
| kk | サッカー(soccer) |
| sakkaa | |
| ss | メッセージ(message) |
| messeeji | |
| tt | ポケット(pocket) |
| poketto | |
| pp | コップ(glass) |
| koppu |
