Have you done your homework?
Teacher:
Have you all done your homework?
Students:
Already!
If you are Indonesian then you’re probably trying to construct present perfect tense. For Indonesians your options are generally already and not yet. However, you should think about using more present perfect in your English, especially if you’re preparing for IELTS.
Using present perfect accurately and appropriately will increase your score for grammar in IELTS speaking and writing:
Teacher:
Have you all done your homework?
Students:
Yes, we have!