Нужно определить видовременную форму и залог у глагола-сказуемого

Помогите пожалуйста кто знает! Нужно определить определить видовременную форму и залог у глагола-сказуемого:
THe climate of Ukraine is determined by its geographical loocation.
We were sitting in the garden when it suddenly started to rain.
Pripyat is the center of the forbidden zone, a circle, 30 kilometers across, which has been sealed off from the outside world .
Bread has been the main food product and it has been compared with gold, with the sun and life itself.
The cultivation machines produced by this plant are being used in agriculture