How to read dictionary and mapping with Esperanto.

How to read dictionary. E.g:
Hasaba u (Hasb, Hisaab, Hisbaan, Husbaan) to compute, to count, etc. etc

The arrangement follows the pattern of Daraba yaDribu Darbaan.
u is for now: yaHsubu
and Darbaan has many forms. Can be Hasb, Hisaab etc.

Mapping with Esperanto

For thingdo/verb:
past _is
now _as
later _os

Daraba       _is
yaDribu     _a
Darbaan     _i
Daaribun    -anto
maDruubun  -ato
iDrib   _u
(place) maDrab  _eyo
(tool) miDrab   _ilo