I will finish the work by tomorrow.

我会在明天完成这项工作。

She finished the work ahead of schedule.

她提前完成了工作。

They have finished the project.

他们已经完成了项目。

I have been working on this project for the past month.

我过去一个月一直在做这个项目。

By the end of this week, we will have completed the work.

这周底之前我们会完成工作。

这些例句展示了"work"的完成时态在不同语境下的应用。希望这些例句对你有所帮助。