I forgive you.
我原谅你了。

It's best to forgive and forget.
最好还是不记前嫌。
I decided to forgive him because he is still young.
我打算原谅他，看在他还小的份上。
I know I have hurt your feelings and I want to beg your forgiveness.
我知道我伤了你的心，我想请求你的原谅。
"I forgive you."
“我原谅你了。”

快快发给好友，随学随用！