Entry record from Remijsen (2017): Matbat
ba
(1) prep. with (non-animate accompaniment).
ma¹li³m ha¹n ba yi¹nbasil is cooked with fish
yak kani¹²¹m te³ ba go¹l po²¹wI drink tea without sugar
(2) prep. with (instrumental).
ya²¹k tɔ¹² wa³w ba yu⁴¹I hack the pig with a chopper
(3) prep. at (marker of time).
bɔ³t ba³¹ – kɔ³t ba wu²¹yoWhen did you come? I came earlier on [same day].
(4) prep. derives adverbial.
ya²¹k ka³p bali¹w / bawa³yI row a little / a lot
Note: also as question word, with tone ³¹