The particles ta (IPFV), sa ta (PROG+ IPFV) and ál (MOD) always precede the verb. In cumulation, the order is MOD + PROG + IPFV. Anteriority is expressed by adding the ending -ba, anteriority + passivity by adding the ending -da (passivity without anteriority by adding the ending -du).
Source: da Silva 1987: 34
Source: da Silva 1987: 63
Source: da Silva 1987: 169
Source: da Silva 1987: 36
Source: Veiga 1987: 132