帮忙写一篇英文邀请函邀请朋友来参加生日聚会.开头：donothesitatetomakearequestifitisreasonable要求：maketherequestspecific,usingapolitetoneconvincinglythereasonfortherequestlettherecipientknowwhyyo

　　帮忙写一篇英文邀请函邀请朋友来参加生日聚会.

　　开头：donothesitatetomakearequestifitisreasonable

　　要求：maketherequestspecific,usingapolitetone

　　convincinglythereasonfortherequest

　　lettherecipientknowwhyyoucametohim/herforhelp

　　mentionitifthereissomethinginreturn

　　donothesitatetomakearequestifitisreasonable这个也是要求!不是开头!不是生日.