Пожалуйста помогите с английским, СРОЧНО.

Нужно объяснить значение окончания ing в каждом предложении.

1. Being quite different from vacuum tubes and transistors, masers operate entirely on quantum principals.
2. Steel castings are extremely difficult to machine unless unheated3. Of the temperatures and pressures occurring in an internal combustion engine, those that are likely to be of most interest to the designer occur immediately after combustion, that is, they are the peak values.
4. The molecules of even a good insulator being acted upon by an electric field, there is a motion of electrons due to this field.
5. The name electronics is known to be derived from the word electron, the electron itself being the basic unit of negative electricity and all electric currents consisting of electrons in motion.
6. Nothing is known about the aerial being out of order.
7. With the property of plastics being superior to that of wood, the designers are believed to be working at the problem of replacing the latter wherever possible.
8. Selecting a local area network architecture and system that will provide the optimum service to the users requires up front analysis and knowledge.
9. They succeeded in obtaining good results working with quicksilver, it being known to be a very dangerous metal.
10. The effect is highly dependent on frequency, with the lower frequencies showing less noise.