When negating a Khasi verb, explain the distinct usage and typical placement of the negative particle 'ym' compared to 'da', providing a sentence example for each.

Negating a Khasi verb involves indicating that an action or state is not occurring, has not occurred, or should not occur. In Khasi, the particles 'ym' and 'da' are central to this process, each having distinct usage and placement based primarily on tense, aspect, and modality. The negative particle 'ym' 'Ym' is the general negative particle used primarily to negate verbs in the present and future tenses, indicating that an action is not happening or will not happen. It denotes a simple non-occurrence of an event or state in the present or future. The typica....