Learn more vowel extensions in katakana more examples!
Prolongation of vowels in katakana
Prolonging vowels in katakana is much simpler than in hiragana. All extensions are performed using ー. That's right, just put the ー after the vowel (syllable ending with a vowel) that we want to prolong. Check it out:
コンピュータ (conpyuuta – from English computer) – Computer
テーブル (teeburu – from the English table) – table
チーズ (chiizu – from English cheese) – Cheese
As the words are of foreign origin (from outside Japan), we write them in katakana and use ー to make the vowel lengthening. In katakana there is no exception to this rule.