1.没关系
It doesn't matter.
e.g 你去或不去,对我都没关系.
It doesn't matter to me whether you go or not.
“我的吹风器坏了.” “没关系,你可以用我的.”
“My hair dryer's broken.” “No sweat,you can use mine
2.不用谢
You're welcome
e.g 不用谢我.我只是尽作爷爷的职责.
Grandpa:Don't thank me .I'm just being a grandfather.
不用谢.能为你服务那是我们的荣幸.
You are welcome .It's our pleasure to service you
不客气
You are welcome
e.g 不客气.希望你在这里工作愉快.
You are welcome.Enjoy your work here