Подчеркните сказуемое в следующих предложениях и переведите эти предложения на русский язык:
1.The power ventilators were purifying the air in the room for half an hour.
2. What time is the next train leaving?
3. The liquid will be boiling while you are mixing other components.
4. He was speaking to somebody when I came into the room.
5. Now solar energy and its usage are being studied by a lot of research groups.