2025-01-12
The past tense is constructed in this way:
[biti verb] [past participle][suffix]
The past participle is constructed by removing "ti" from the infinitive and adding the suffix, depending on gender and number
Verbs with -ći infinitive form the past participle with either k or g (reći -> rekao, pomoći -> pomogao, moći -> mogao). Notice that the masculine suffix is -ao, not -o.
Verbs with -sti infinitive are to be considered irregular with regards to the past participle. The participles have to be looked up and learned.