Learn Portuguese (Portugal): A primeira tarefa já está feita.

Here, the irregular past participle of fazer (feito) is acting as an adjective to describe the noun. Since a tarefa (the task) is a feminine word, the participle must change to match its gender, becoming feita.

Wait, is feito completely irregular?

Yes. For regular verbs, the past participle ends in -ado or -ido. But fazer (to do / to make) has a highly irregular past participle: feito. This is one of a small group of common verbs you just have to memorize, along with words like aberto (opened) and dito (said).

Why do we use está (from estar) instead of é (from ser) to say the task is done?

We use estar because being done describes the current state or condition of the task resulting from an action. It is not a permanent, defining characteristic of the task itself, which is when you would typically use ser.

Could I put já at the end of the sentence, like A primeira tarefa está feita já?