Раскройте скобки, поставив сказуемое в одно из времен Perfect Progressive.

Question

Раскройте скобки, поставив сказуемое в одно из времен Perfect Progressive.

Руслан Бакарев Ученик (69), открыт 3 недели назад

1. Scientists are determined to curb harmful emissions that (to release) for tens
of years.
2. The new legal act helped to save rare forests which the Forest Service (to
protect) before.
3. The wooden buildings still in use in Finland date from the 18th and 19th
centuries. Just to remind us that wood (to support) sustainable development
for hundreds of years.
4. When I saw him, he (to wait) for the doctor for 1 hour.
5. I (to read) this novel since summer.
6. My son (to collect) postcards since his childhood.
7. When you arrive I (to translate) the scientific papers for 2 hours.
8. When I called her she (to try) to calm the baby for half an hour.
9. My sister (to attend) the music classes for a couple of months but she is still
far from any progress.
10.At 3 o’clock yesterday he (to defend) his thesis for 2 hours already. I
couldn’t stay any more.
11.Philosophers (to speculate) on the rules of human relationships for thousands
of years.
12. As wildlife biologists, my brother John and I for years (to use) these
mountains as an outdoor research laboratory

Answer 1

1. Scientists are determined to curb harmful emissions that have been releasing for tens of years.
2. The new legal act helped to save rare forests which the Forest Service had been protecting before.
3. The wooden buildings still in use in Finland date from the 18th and 19th centuries. Just to remind us that wood has been supporting sustainable development for hundreds of years.
4. When I saw him, he had been waiting for the doctor for 1 hour.
5. I have been reading this novel since summer.
6. My son has been collecting postcards since his childhood.
7. When you arrive I will have been translating the scientific papers for 2 hours.
8. When I called her she had been trying to calm the baby for half an hour.
9. My sister has been attending the music classes for a couple of months but she is still far from any progress.
10. At 3 o’clock yesterday he had been defending his thesis for 2 hours already. I couldn’t stay any more.
11. Philosophers have been speculating on the rules of human relationships for thousands of years.
12. As wildlife biologists, my brother John and I had been using these mountains as an outdoor research laboratory for years.
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