go i bid you a farewell	go i wish to draw your attention to the	go i'm afraid i have to leave now
go i refer to your letter of (date) concerning	go i wish to draw your attention to the я хотел бы привлечь ваше внимание к	go i'm afraid i have to leave now боюсь, мне необходимо сейчас уйти
go i refer to your letter of (date) concerning ссылаясь на ваше письмо от (дата) относительно	go i wish to inform you that	go it’s nice to have you back!
go i think	go i wish to inform you that я хотелбы сообщить вам, что