初一英语自编对话要关于“邀请人参加音乐会”“卖东西”“讨论音乐”各一篇,初一水平就行,要剑桥英语的,

买东西:A:Can I help you?B:Yes,please.I want a shirt.A:What color do you want?B:Blue.A:Here you are.B:How much is it?A:It's 20 dollars.B:Thank you .A:You're welcome.