'We regretfully advise you...' or 'We regret to advise you...' would be correct versions of your example.
The present perfect tense of regret is:I/You/We/They have regretted.He/She/It has regretted.
Genesis chapter 6:6
The past participle is regretted.
Yes, I have regretted cosigning a loan for my ex.
No, I have never regretted skipping arm day at the gym.
Yes, I have regretted cosigning a car loan for my ex.
The cast of Deeply Regretted By - 1978 includes: Donal Farmer as Priest
Regretted.
no
Yes all of his tattoos are permanent and yes there real. In an interview or something he did say he regretted a couple of his tattoos
Apollagise for being mean and then say that you still want to be friends but you understand if he doesn't and that you are very ashamed and sorry that you were mean and regretted it right after it came out of your mouth.
Regretted