Ответы
8 Rewrite the sentences in perfect continuous tense using time adverbials given in parenthesis.
Example
I study behavior of wild elephants (lately).
Lately I have been studying behavior of wild elephants.
1 Recently John has been creating amazing visual illusions.
2 Jane Goodall has been studying chimpanzee all her adult life.
3 Marie Curie discovered radioactivity and new diagnostic methods in
medicine were developed (since). perfect continuous tense не принято использовать в страдательном залоге
4 Many myths about use of tool by animals were dispelled (recently). perfect continuous tense не принято использовать в страдательном залоге
5 The scientific phenomenon of a deja vu is not fully explained (yet). perfect continuous tense не принято использовать в страдательном залоге
6 Scientists have been trying to explain the phenomenon of sailing stones for years.