Найдите сказуемые, определите время каждого сказуемого и дайте формулу, по которой они образованы: 1. The direction of the nerve fibers has already been established experimentally. 2. Several new medical schools have been founded in our country recently. 3. The exact amount of the blood in the experimental animal has just been estimated.

1. has been established
 2. have been founded
 3. has  been estimated

Во всех трех предложениях время Present Perfect Passive.
Настоящее завершенное время в пассивном залоге.
«have / has»+«been»+ V3 (Ved)