bakit: why

bakit mo siya iniwan?
why did you leave him/her?

bababa: to go down

bababa ako ng hagdan
i will go down the stairs

baha: flood

ang taas ng baha!
the flood is high!

bakas: trace/mark

nag-iwan siya ng bakas
he left a trace

bukas: tomorrow

bukas ay walang pasok
there are no classes tomorrow