Определите видо-временную форму и залог глагола-сказуемого

Определите видо-временную форму и залог глагола-сказуемого
1.Various kinds of equipment are being sent from England.
2.Recently rich diamond fields have been discovered in Yakutia.
3.The theory of gravity was developed by Isaac Newton when he was only 24.
4.The ancient Greeks are known to have used water clock for timing the speeches of their orators.