(1) (Adopted from Haraguchi 1995: (6) In Tokyo Japanese, the accent is placed on the mora before the pitch drop; in other words, the accent is on the H immediately before L. (Haraguchi 1999: 5) As dare-mo in question has the same tone melody as (1c), as is shown in (2), it is considered to be an unaccented word.
( 2)The tone melody of "NPI" dare-mo dare-mo L H H the near-homonymous, "non-NPI" dare-mo has the tone melody as illustrated in (3), which is of the same pattern as in (2a).