We are regretful to inform you that ....官式文章，「感到遺憾」 -or- We feel deeply regretful that ...「深表遺憾」
"Grasp at time, or if you'll be regretful." or "You will regret if you don't grasp at time." * grasp at 是片語...quot;這個動作的後面,那麼把握時間都用現在式,"將會"後悔當然要用will be regretful囉!
We are regretful and sad to receive the news of the withdrawal from your company. We have...