be done是什么时态?

This job could be done equally well by a computer.

这个工作用计算机同样可以做得很好。

What is to be done about this problem?

该如何处理这个问题？

All these jobs can now be done by one single machine.

所有这些工作现在只用一台机器就可以完成。

There is still an immense amount of work to be done.

还有非常非常多的工作没有做。

They gave no indication of how the work should be done.

他们根本没说明这项工作该怎样做。