Datapoint Creolese/Uses of the habitual marker

The form /das/ is neutral for time reference. In past contexts, it carries a past meaning and in present ones, it signals the present. The /das/ in Example 77 can indeed be replaced by /a/ as in the following example:
yu a chroo manyoor, yu beel pont, yu noo, aal difren taip a wok 'You used to manure the field, you used to bail punts, you know, all different types of work.' (Rickford 1987: 145, lines 327–328)

Values

Habitual, progressive and future Frequency: 50.0%

Example 5-19:
from fraidi nait yu a ge piipl stedii
from
from
fraidi
Friday
nait
night
yu
you
a
asp
ge
get
piipl
people
stedii
regularly
From Friday night people are continuing to pour in.

Source: Rickford 1987: 146 (line 338)

Example 5-75:
aal o dem a jomp forom
aal
all
o
of
dem
them
a
prog
jomp
jump
forom
for.it
All of them were jumping in to get it.

Source: Rickford 1987: 131 (line 253-4)

Example 5-76:
mi a go skuul tumara
mi
1sg
a
incep
go
go
skuul
school
tumara
tomorrow
I will go to school tomorrow. OR: Tomorrow I will go to school.
Confidence:
Very certain

Only habitual function Frequency: 50.0%

Example 5-77:
dem das plaant dem faam an ting an dem das yuus-tu stan de
dem
3pl
das
hab
plaant
plant
dem
poss.3pl
faam
farm
an
and
ting
thing
an
and
dem
3pl
das
hab
yuus-tu
pst.hab
stan
remain
de
there
They used to cultivate their farm and so on, and they used to stay there.

Source: Bickerton 1975: 67

Confidence:
Very certain