1.That'sverykindofyou,butIamafraidthatIamtiedupthatday.Thankyouforaskingmeanyway.你真好，但那天我恐怕很忙。无论如何还是谢谢你邀请我。tiedup忙得不可开交的2.Thanksforinvitingme,butIamalreadybookedupthatday.Iamsorrytoturnyoudown;IhopeIcanmakeitnexttime!谢谢你邀请我，但我那天的行程已经排满了。我很抱歉拒绝你，我希望下次可以参加!bookedup时间已排满参考资料
