不用谢（各有三种说法,

thank you you are welcome
thanks a lot not at all
thanks my pleasure

三种“谢谢”：
Thank you
Thanks a lot
Thanks
三种“不用谢”：
You are welcome
Not at all
My pleasure

Thank you .
Thank you very much.
Thanks a lot.
You are welcome .
Not at all.
My pleasure .

Thanks. No worries.
Thank you. It's alright.
Thank you. My pleasure.
Thanks. It's OK.
...有很多很多种说法的。以上是一些我在国外听到的最自然跟常用的说法

Thank you. You are welcome.Thanks. Don't mention it.Thanks a lot. It is my pleasure.此外,谢谢有时候还可以用：It is very nice of you/ I really appreciate it/ I owe you/ I feel grateful......

Thank you. You are welcome.
I really appreciate it. Not a problem!
Thanks a lot. Don't mention it!
Thank you so much. Not at all.

thank you
you're welcome
thanks a lot
not at all
thank you very much
Don't mention