Обусловьте форму и функцию глаголов to be, to have. 1.

1. All articles are published from The Economist print edition.
(are publised) -  are - вспомогательный глагол, часть составного глагольного сказуемого в пассивном закладе2. The Economist online is part of The Economist Group and is responsible for The Economist on the internet. is - глагол связка3. Leaders are discussed, often disputed, each week in meetings that are open to all members of the editorial staff. 
are discussed - вспомогательный глагол (часть составного глагольного сказуемого в пассивном залоге)
4. Since 1928, half the shares have been owned by the Financial Times.
have (been owned) вспомогательный глагол в пассивном перфектном медли
5. The Economist has survived, and indeed prospered, by building on the internationalism of its outlook and by selling abroad.
has - вспомогательный глагол, служит для образования перфектного медли