Question

Подчеркните сказуемое следующих предложений, укажите время, видовременную группу, залог.

1. Modern medicine has been making extensive use of various antibiotics.
2. Russian science had produced a series of new drugs before new generation of antibiotics made its appearance.
3. It has been established that the composition of its molecule includes iron.

Answer 1

Ответ:

1)has been making (present perfect continiuos)

2)has produced (past perfect)

3)has been established (present perfect)