The affirmative present perfect tense is used to talk about something that started in the past and continues up to the present. The formula is 'has/have + past participle'.
Thibitisho la wakati wa sasa kamili hutumika kuzungumzia kitu kilichoanza kwenye zamani na kinavyoendelea hadi sasa. Fomula ni 'has/have + past participle'.