The boss gave me a gratis book when I went to the bookstore last week.

上周我去书店的时候，老板给了我一本免费的书。

This scarf was given when I bought a down jacket, gratis!

这条围巾是买羽绒服的时候送的，不要钱的！

This order means that our previous investigations were gratis.

这条命令意味着我们前期的调查都白做了。

Medical advice was provided gratis.

医疗建议是免费提供的

I knew his help wouldn't be given gratis.

我知道他的帮助不会是无偿的。

David gives the first consultation gratis.

戴维免费提供第一次咨询。

What I did for you was free, gratis, you understand?

我为你所做的都是免费的、不收钱的，你明白吗？

We provide gratis service.

我们提供免费服务。

All this work is gratis.

所有的工作都是免费的。