Перепишите предложения. выпишите из них глагол-сказуемое, определите их видовременную форму, залог и укажите инфинитив. 1.a new concept is based on our understanding that earth is an integral system. 2.many of the water sources in the country have been polluted with industrial or communal waste.
2have been polluted-Present Perfect Passive, инфинитив to pollute