1, The machine is regularly serviced by the mainenance department
2, The production unit was checked last week
3, The tools are being cleaned by the apperentice at the moment
4, The plans will be made ready by the end of next week
5, Before the test, the new material had already been worked with
7, The new tissues have been produced for a couple of months by the factory
8. The accident happed while the machine was being cleaned
