Подчеркните сказуемое в следующих предложениях


1. What is boiling in the flask
2. The ship will be crossing the channel at 9 о'clock according to the timetable.
3. They were mounting the new machine-tools from 5 to 7 о'clock.
4. An interesting research is being done at our institute.
5. What are you doing tonight?

это сказуемое

спасибо

сказуемое.и видо-временные их формы

во2 не PassiveаActive.пардон)))))))

1is boiling-Present Continuous Active2will be crossing- Future Continuous Passive3were mounting-Past Continuous Active4is being done-Present Continuous Passive5are doing-Present Continuous Active