Задание

Is "TO BE" main or auxiliary verb in the following sentences? Choose the correct variant.

I am taking a bath.

main

auxiliary

She is preparing dinner for us.

main

auxiliary

They have been studying all night.

main

auxiliary

I was given a free meal.

main

auxiliary

He was seen by fans at the airport.

main

auxiliary

This song has been sung by all nations.

main

auxiliary

They are fifteen years old.

main

auxiliary

They are not fifteen years old.

main

auxiliary

Are they fifteen years old?

main

auxiliary