1). Many thanks for your letter of August 3…
2). We have acknowledged the receipt of your letter of March 5…
3). We have the pleasure of stating, in answer to your inquiry of April 7
4). We are pleased to acknowledge receipt of your letter of July 2…
5). You letter of July 23 gave us much pleasure…
6). We thank you very much for your inquiry of October 7…
7). We have the honor to let you know…
8). We are pleased to inform you that…
9). The purpose of this letter is to inform you that…
10). We feel it our duty to inform you that (/of)…
11). Please allow us to call your attention to…
12). We regret to inform you that (/of)…
13). We are indeed sorry to hear that…
14). It gives us deep regret to announce to you that…
15). The object of this letter is to inform you that…
1). We hope to receive your letter at an early date.
2). We should appreciate an early reply.
3). Kindly reply at your earliest convenience.
4). Please send us your reply by the earliest delivery.
5). I trust that you will reply to us immediately.
6). We look forward to receiving your early reply.
7). As the matter is urgent, an early reply will oblige.
8). We are anxiously awaiting your reply.
9). I have to apologize to you for not answering your letter in time.
10). I hope you will forgive me for not having written to you for so long.
11). We regret the trouble we are causing you.
12). We hope you will pardon us for troubling you.
13). I hope we may receive your further information.
14). Your early reply is definitely appreciated.
15) I expect to get your reply as soon as possible.
1). I’m glad to hear that you have gotten a promotion.
2). I’m delighted to learn that you have passed the entrance exam.
3). I’m sorry to hear that you failed on your final exam.
4). I feel sad to learn that you did not get a raise this time.
5). I hope this letter finds you well.
6). How have you been doing?
7). Wish you a big success.
8). I’m thankful to you for your assistance.
9). I appreciate very much your warm assistance.
10).I’m so happy that you did a good job.