It's my pleasure,My pleasure,Never mind,Don't say so,……情景交际的回答到底是怎么回事,有什么讲

It's my pleasure 我的荣幸; 这是我的荣幸.
A:This lunch is on me today,
B:I think you got it last time.
A:It's my pleasure.
B:That's very nice of you.A.
今天这顿饭算我请客.
B：我记得上回也是你请的.
A：我请得心里高兴.
B：既然这样,那就多谢了.
口语中,It's my pleasure.用于乐于为对方服务.
不过,见下句：
Welcome to Beijing,my dear foreign friends!It's my pleasure to meet you here.
欢迎来到北京,我亲爱的外国朋友们!很高兴在这里与你们见面.
这里It's my pleasure to do =I'm glad/pleased to do
my pleasure 我很荣幸；别客气；非常高兴为您服务 同It's my pleasure
never mind 没有关系,不要记在心上
用于回答别人的道歉.
Don't say so
You don't say so.未必吧,不至于这样吧.
O Miss Jane!don't say so!
简小姐!别这样说!
'Don't say so,Lily.You shouldn't be so tart to her.Anyway she is my bosom friend and helped me when I was in scrape.'
‘别这么说,莉莉.你不该这么刻薄地对她.不管怎样,她都是我的知心朋友和雪中送炭的贵人啊.’
比较口语化.
知识在于点滴积累,更在于不懈努力.
——另外,正在冲正确率,请记得采纳,