1.I present this gift as a token of our appreciation
A:John, I present this gift as a token of our appreciation for what you've done for us.
B:You shouldn't have done this. I just did what I should have done.
2. I regret 我很遗憾
A: I regret for what happened to you.
B: You just regret? What are you going to do?
3.I want to say a huge "Thank you!" to...
A: After forty years of service, Mike is retiring from our company. I want to say a huge "Thank you!" to Mike.
B: Thank you so much for your appreciation.
4.I want you to know how much we appreciate
A: I want you to know how much we appreciate your help.
B: It's my pleasure.
5.I was truly touched 我真的感动
A: I was truly touched by what I've seen.
B: What a dedicated worker he is.