当拒绝别人的邀请时说：“I am sorry,but I can't”中的but 怎么翻译?

当拒绝别人的邀请时说：“I am sorry,but I can't”中的but 怎么翻译? 是I'm sorry I can't 还是I'm sorry but I can't but may be 、I can’t 、I’m sorry 翻译i'm sorry,but i can't let you check out these books I am so sorry But I love I am sorry but I love you. Sorry,but I can't agree on you.（改错） I am a superman,but I can't fly . sorry i miss you! but i'm don't see you!怎么翻译? 英语翻译I am a dragon,but I can’t fly.I am a snake,but I can’t b 猜灯谜： I am a dragon,but I can't fly. I am a snake,but I can't I am a dragon,but I can't fly.I am a snake,but I can't bite.