Question

Пожалуйста помогите определить время сказуемого. 1. Their inventions have been transforming the whole course of scientific achievements since that time. 2. The students had been discussing the report for 20 minutes by the time I came and took part in the discussion. 3. They will have been testing this material until they get all the necessary data.

Answer 1

1.present perfect continuous
2.past perfect continuous
3.future perfect continuous