Next, for the verbs that end with the vowel "I" in the syllable just before MASU, there are two patterns. One pattern is to change MASU to RO. "To get up," OKIMASU, becomes OKIRO (Get up!).
Watch this short video to see some more examples of silent letter words. Vowel sounds are made by the letters 'a', 'e', 'i', 'o' and 'u'. Unstressed vowels are vowel sounds that are hard to hear ...
For example, TABEMASU (to eat), becomes TABERU. Next, if a verb has the vowel I in its syllable just before MASU, there are two patterns for this conjugation. For one, you remove MASU, and add RU.