What is the optimum way to tell someone to do their work?
What is the best way to say “to do someone’s work”?
What happens if I am doing my sister’s homework, because she needs a bath or because she feels so tired? How to say it?
What are the pros and cons of this article?
From someones direct translation that simple, “to do someone’s work for them.” In your example, “I’m doing my sister’s homework for her.”
If you intend to do someone’s work because he or she is not available, I think there is a phrasal verb with similar meaning:
stand in: to do someone else’s job temporarily while they are not available to do it
Lorraine was ready to stand in all of if Helen got sick!
I’ll be standing in for Peter while he’s away from the office.
What are the most important words to use, and how are they to be effective?