Помогите понять предложение: During the last hundred years many methods of building have...

Question

Помогите понять предложение:
During the last hundred years many methods of building have been discovered

Answer 1

During the last hundred years many methods of building have been discovered ( present Perfect Passive)

Answer 2

В последние 100 лет было изобретено множество методов постройки зданий.

Comments

ну мне нужно конкретнее, какое это предложение..с временами

---

Past Continuous Past Simple

---

have been почему

---

Present Perfect Continuous значит. Запутался.