请问I am sorry to turn you down.

请问I am sorry to turn you down. I am so sorry to let you down i'm terrible sorry to turn you down this time,but I promise I'm sorry to turn you down.这句话用汉语怎么说 I am sorry I haven't got back to you soonet but I drove down I am sorry to you I am sorry foryou I am sorry to trouble you I am sorry to trouble you but.. i am sorry to trouble you -__________ i am sorry to trouble you .( ) I am sorry just to trouble you! why do you turn down?I am not perfect?I know I am not very c