Dhéanfadh sé maitheas dom. = It would be a benefit to me, Pé méid airgid a fuair sé ní rinn' sé aon mhaitheas do. = Whatever money he got didn't do him any good.
ag déanadh maitheasa do = benefitting him. Ní mórán maitheasa a rinn' an t-airgead a fuair sé do. = The money he got did not benefit him much. Brathaim é ag déanadh maitheasa dhom. = I feel it doing me good.