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Thank you for Jiayin's question.
In a sense that "onaka suita" is a casual form, you could say that it is following a different grammatical rule.
"Onaka" means stomach, but "suita" is the past tense of the verb "suku", which means to go empty or to become less crowded.
For how the formal sentence changes to the informal sentence, you are abbreviating the "ga" particle here, and you are using the basic verb form of "suku" and its past tense "suita" instead of the polite form "sukimasu" and the polite past tense "sukimashita".
How to change from basic verb form to the polite "masu" form, please see the following.
1) For ru-verbs: Remove "ru" Ex: Miru (to see, basic) → Mi + masu → Mimasu (to see, polite)
2) For u-verbs: Remove "u" and change to "I" Ex: Kau (to buy, basic) → Kai + masu → Kaimasu (to buy, polite)
Exceptions: suru (to do) → shimasu, kuru (to come) → kimasu
You can see that "suku" is an example of "u" verb. Therefore, for the polite masu form is, remove "u", add "I"+masu, which results in "sukimasu" and the past becomes "sukimashita."
Hope that helps!
0 votedMay 12, 20160- Learning Article : Useful Japanese Phrases For Mealtime
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<a href='/article/731/useful-japanese-phrases-for-mealtime' target='_blank'>Useful Japanese Phrases For Mealtime</a>
Having a meal is one of the most important events in our daily lives. If you have the opportunity to have a meal with a Japanese friend, will you know what to say before, during, and after the meal?
May 9, 201681 My introduction
Hi, I'm Noryco living in in Tokyo. I'm an architect designer.
I like photography(My Instagram's ID is →nagan0ri ), snowboarding, watching baseball games(with beer), nail art, cooking, eating, and especially travelling!
Countries I have been are Germany, France, Italiy, Holland, Belgium, the United States, Vietnam, Cambodia, and HongKong. Every country was great.
I want to learn English because I want to be able to have conversations with people from overseas.
On italki, I am looking for language exchange friends, friends with same hobbies, and English teachers.(My English is a beginner level.)Of Course I will teach you Japanese if you like!
Feel free to send me a message if you are interested.0 votedJanuary 15, 20162

