英语翻译810508i have his telephone number by chance

I know his telephone number 有关动词语态时态的----I____his telephone number.----I have his number have you written down his telephone number I didn't know his telephone number ___ did he tell me his telephone number?I have no idea. ___ did he tell me his telephone number?I have no idea His telephone number ___me ,or I would have called him up 关于英语基础题改正下列错误的句子1.“I forget his telephone number”.“I have hi could you tell me his telephone number now?Sorry,I--------- I Know his telephone number改成一般疑问句 I know his telephone number.(改为一般疑问句） 英语翻译if i know his telephone number,i will tell you（我感觉不太对）if