Questions & Answers about Stroj mora isprati rublje.
- stroj = machine
- mora = must / has to
- isprati = to rinse out / to wash out completely
- rublje = laundry / clothes / linen
So the structure is basically:
machine + must + rinse/wash out + laundry
Stroj is in the nominative singular because it is the subject of the sentence — the thing doing the action.
Its basic dictionary form is also stroj, so nothing has changed here.
Mora is the 3rd person singular form of morati, which means must or to have to.
Because the subject is stroj (machine), Croatian uses mora:
- ja moram = I must
- ti moraš = you must
- on/ona/ono mora = he/she/it must
Since stroj is grammatically treated like it, mora is the correct form.