祝贺信常用的语句有：
①Congratulations on your success /achievements!
②I＇m so glad to hear of your winning the prize in the … contest. Congratulations!
③Please accept my heartiest congratulations on your graduation from….
④Heartiest congratulations upon your graduation. May your future be as successful as your middle-school days have been.
⑤A word of congratulation just doesn＇t seem enough, so I am sending you a gift that I am sure you will find useful.