never mind的用法
1.when you don't want to bother with something you don't want to do
劝某人，别因为某人或者某件事情而烦恼时
"Never mind him, he is just a jerk."
别因为他而烦恼，他是个混蛋。

2.when you changed your mind about doing something
当你改变自己的想法时
"Never mind. I don't want to go out anymore."
没事，算了算了，我也不想出去了。
"I changed my mind. I don't want to go out anymore."
我改变主意了，不想出去了。

3.can be used to tell someone not to worry
当你要告诉别人，不用担心时
"Never mind about what I just said. It is irrelevant."
我刚刚说的那些，不是很重要，别担心。

4.Never mind！
不用谢/没关系！

拓展一下
1.Drop it! 别提了！
"Hey, how much are they paying you?"
嗨，他们付给你多少钱？
"I already told you to drop it!"
我告诉你别提了！

2.Ignore it! 忽视它吧！
You should ignore it. It is just spam email!
你应该忽略它，这只是个垃圾邮件！