to do wonders (for) = to be surprisingly beneficial to someone or something; to be very helpful with someone or something.
I was run out and drained of energy, but a week of complete rest did wonders for me.
to do the donkey work = to do the hard, boring part of work or manual tasks
Why is it always me who does the donkey work in the office?
to do something with one’s eyes closed = to do something easily because you have done it many times
– Show you around the town? – I could do it with my eyes closed!
to do someone a good turn = to help someone
One good turn deserves another. = If someone has helped you, help them in return.
You did me a good turn when I was in trouble, now I owe you one.
to do more harm than good = to be damaging rather than helpful
I am afraid that studying till morning will do you more harm than good.
