Complete the sentences using for or since. a) _________ its failure, Biosphere 2 has served as a research center. b) Deforestation has declined significantly in the Brazilian Amazon _________ 2004. c) Some forests in Southeast Asia have been around _________ at least 100 million years. d) Deserts have existed _________ millions of years, although their location and forms have changed throughout the history of our planet.
Respostas
Resposta:
a) since.
b) since.
c) for.
d) for.
.....................
Resposta:
⇒⇒ Present perfect using ''for'' and ''since''
a) Since its failure, Biosphere 2 has served as a research center.
b) Deforestation has declined significantly in the Brazilian Amazon since 2004.
c) Some forests in Southeast Asia have been around for at least 100 million years.
d) Deserts have existed for millions of years, although their location and forms have changed throughout the history of our planet.
Explicação:
⇒⇒ Present Perfect >>> Indica quando a ação começou ou quanto tempo faz que ela está ocorrendo.
have >> usado com I - we - you - they
has >> usado com he - she - it
Estrutura
Sujeito + have / has + verbo particípio + complemento
David has lived in Texas since 1990.
My sisters have studied English for many years.
→→ situação/ação que começou no passado e continua no presente.
I have studied German since 2017. - Eu estudo alemão desde 2017.
(comecei a estudar alemão em 2017 e continuo estudando hoje)
She has worked at the Mall for 10 years.
Ela trabalha no shopping há 10 anos.
→→ situação que aconteceu durante um período e que ainda não terminou.
Helen has been to the movies twice this week. (a semana ainda não
terminou).
→→ Uma ação terminada em um passado recente, confirmada pelo uso da palavra ''just''
David has just arrived from New York.
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