Question

外国人很有礼貌一直说thank you ，我该怎么回答？

不见得用来用去就那几个吧……总得换新花样才行吧……

Answer 1

not at all.
that's alright
my pleasure
you're welcome
it's my job.(这是我该做的)
it's my honor.(这是我的荣幸,,)这里看情况拉,,看你为他做了什么咯.

Answer 2

就说 You are welcome.It's my pleasure.（It's really nothing.）It's my job. 就好了啦～
你还想说什么？
要不就再加上 sir mister ma'am miss.
你要是懂法语、德语、意大利语、西班牙语，就用这些语言来回答好了～

Answer 3

他爱说就让他去说,
以不变应万变!

Answer 4

say it again
等他再次说完了你就说 again and again
够花样了吧？

Answer 5

No thanks!
Not at all!
Taht's alright!
My pleasure!