godan verb (-ru), transitive verb
do for someone; do a favor
Expresses doing something for the benefit of another person, often with a nuance of condescension or doing a favor. The subject is the doer, and the action is directed toward someone else.
弟の宿題をしてやった。
I did my younger brother's homework for him.
友達に料理
I plan to cook for my friend.
godan verb (-ru), transitive verb
Used when someone is tricked or taken advantage of, often in a competitive or adversarial context. The subject deceives the object.
あの詐欺師にまんまとしてやられた。
I was completely taken in by that con artist.
彼はライバルをしてやろうと企んでいる。
He is scheming to hoodwink his rival.