Negation is used to express the opposite meaning of affirmative sentences. Negation in Nepali verbs takes place due to affixation(suffixation and prefixation). The negative case marker न(na) is either prefixed or suffixed with verb roots or verb forms to express negation.
Negation due to Prefixation
Negation in some verb forms occurs when the morpheme न(na) is prefixed to the verbs. Some of such verb forms are given below.
Negation due to Suffixation
Negation in Nepali verbs can also occur due to suffixation of the morpheme न(na) to verb forms/ verb roots. The morpheme can occur either at the end or in the middle of the negated verb.
For the following verb forms, negation occurs due to suffixation.
References
A Computational Analysis of Nepali Morphology: A Model for Natural Language Processing