for free 免费 free of charge;for nothing

例句：

People living in that city can use their public transportation for free.

住在那个城市里的居民可以免费使用公共交通设施。

I got this for free.

我免费得到了这个。

A:Hey, would you like to go out for a movie with me tonight? I got two tickets for free.

嗨，今晚和我出去看电影好吗?我得到两张免费票。

B:I'd love to, but I have to finish my work first.

我很乐意，但是我得先完成工作。