Yoko Iyieri PhD Thesis - Research@StAndrews:FullText - University ...

As the above table shows, modal verbs in general display a stronger
tendency to include ne alone than verbs of the other types. This is
consistent and fairly clear with all the texts of this group. It is
most reasonable, therefore, that forms of wifi, which belong to the
category of modal verbs, tend to occur in the construction in which
the adverb ne is not accompanied by not or never, no, etc.
It is quite possible that this peculiar feature of modal verbs
comes to be slightly blurred in later texts where the adverb ne
declines in the same way as the distinction between contracted forms
of will, witen and contracted forms of be, have tends to be blurred
in later texts. The table below displays the situation of the texts of
Group 2:
110