类似于not at all等等这些日常用语的用法

Question

有关这些日常用语：not at all、that's OK、it is a pleasure、you're welcome还有that's right、that's all right和all right

1.我搞不清楚意思
2.我不知道如何用

麻烦各位跟我讲讲吧，最好举几个例子，拜托了...

Answer 1

这么多人回答这么多话～～
我来说下摘自初三英语考纲上的吧～
apology:道歉
A:sorry
B:that's all right./never mind./don't worry./it doesn't matter.

道谢：
A:thanks./thank you./many thanks./thank you very much indeed./thanks a lot.
B:you're welcome./it's a pleasure./my pleasure./that's all right./not at all.

邀请：
A：can i join you ?
B：sure,you are welcome.
这是最标准的了～～