She's always trying to get something for nothing.

她总想不劳而获。

You want something for nothing!

你只想得到不想付出！

I had been getting something for nothing.

我没有付出代价就得了手。

You're never going to get something for nothing.

你永远不会得到些什么。

There is no such thing as something for nothing!

天下是没有不劳而获这回事的！