Определите в них видо-временную форму глагола и укажите их инфинитив:
1. economic growth of any country depends on the development of agriculture.
2. last year farmers applied more fertilizers than this year.
3. in winter the farmers will keep their cows in cowsheds.
4. they have already plowed the soil and sown wheat.
5. when the students came to the farm the farmers were plowing the soil.
6. the farmers are working in the fields now.