Подчеркните сказуемое главного предложения и определите видо-временную форму и залог глагола . 1. interesting results were obtained after a number of experiments. 2. searching for ore with plants started a new trend in geology 3. later generations will regard antarctica as the natural storehouse of food . 4. modern science and inventions have made a great change in the techniques of exploration

1. Interesting results were obtained after a number of experiments.(Past Simple Passive)
2. Searching for ore with plants started a new trend in geology (Past Simple Active)
3. Later generations will regard Antarctica as the natural storehouse of food .(Future Simple Active)
4. Modern science and inventions have made a great change in the techniques of exploration (Present Perfect Active)