The Plain Speech Level
The plain speech level is conjugated differently for declarative, interrogative, imperative and proposotive sentences. Only verbs can be conjugated for proposotive or imperative sentences.
For declarative sentences
If the predicate is an adjective or a copular, then 다 is added to the stem or to the past tense marker. If the predicate is a verb, 는다 is add to stems ending in a consonant, otherwise ㄴ다 is added to the stem, ㄴ becomes the 받침. If the predicate is conjugated in the past tense then 다 is added to the past tense ending.
The verb is conjugated as while the verb is conjugated . In the past tense, becomes while the verb becomes .
For interrogative sentences
니 or 냐 is added to predicate stems for spoken communication 으냐 can be added to stems that end in a consonants for written communication.The verb can be conjugated as , , .
The verb can be conjugated as or .
The adjective can be conjugated as or
?Is 민준이 your older brother?
For imperative sentences
ㅓ or ㅏ is added to the verb stem followed by 라.
?Do not waste water, please save it.
For proposotive sentences
자 is added to the verb stem.