"اضفى" - Translation from Arabic to English

But he probably knew that he would be sentenced to life with his criminal record.
انه مجرم لها سابقتان و الان اضفى جريمه قتل فهل تظنى انه لم يكن يدرك حقا انه سينال حكم الاعدام ؟

Very nice. That adds a lot of class to that tree. I love it.
لطيف جداً هذا اضفى رونقاً على الشجرة انا احبها

If you are talking to a man, you usually add "monsieur."
و اذا كنتى تتحدثين لرجل اضفى "مسيو"