Perfect tenses are
those that express finished actions
- Present perfect
- Present perfect continuous
- Past perfect
- Past perfect continuous
- Future perfect
- Future perfect continuous
- Perfect infinitive
Al Gore´s
reputation as an activist appears to have overshadowed his fame as a
politician.
It is
estimated that, by 2020, Al Gore´s An
Inconvenient Truth will have become a part of school curricula in
over thirty countries.
By 2026, Al Gore´s groundbreaking film will have
been helping to educate people about global warming for twenty years.
Since the 1990´s Annie Lennox has been working as a
human rights activist as well as a singer.
Annie Lennox´s work has helped to raise awareness
of the HIV epidemic in Africa.
Before becoming a globar star
in the 1980´s, Sting had been a teacher.
His 1991 album was dedicated to his father, who had
passed away.
For several years before Sting began working to save the
rainforest, some estimates suggest that it had been declining at a rate
of around 20,000 square kilometres per year.
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