Japanese Grammar Lesson 9: Casual/Polite form - affirmative pattern

Following last week's lesson about the negative and interrogative patterns of the casual (dictionary form), today I will be explaining about yet another form, which is situated between the casual and the polite ones, so to easily understand, I will be calling it casual/polite form. It has the exact same meaning but it is mostly used in conversations.

Proceeding to the verb construction, it can be quite easily explained!

Basically, you just have to get the casual form, and add "ndesu".

Example sentence: Watashi wa Nihon he ikundesu (I go to Japan).

And that's it!

You got yourself a new verb form, with little effort! ^O^

Here are the old forms, and the equivalent new ones, using the verb iku (to go):

PRESENT AFFIRMATIVEikimasuikuikundesu
PRESENT NEGATIVEikimasenikanaiikanaindesu
PRESENT INTERROGATIVEikimasukaiku(?)ikundesuka
PAST AFFIRMATIVEikimashitaittaittandesu
PAST NEGATIVEikimasendeshitaikanakattaikanakattandesu
PAST INTERROGATIVEikimashitakaitta(?)ittandesuka

P.S.: Can you discover the meaning of the kanji above? I will be saying it in next week's lesson! Hint: It describes today's lesson!