Найдите и подчеркните в них объектный и субъектный инфинитивные обороты:
1. Scientists do not consider this effect to be an experimental error of any kind.
2.The distribution system consists of a series of structures which permit the water tables to be raised to an uniform depth below the ground surface over the entire area. 3. Better results are known to be obtained by seeding wheat with the drill.
4. Dark-coloured soils are considered to suggest higher productivity than light-coloured ones.
5. This crop appears to be fully developed in all areas of the United States.
6. They heard the farmer speak about the new crop to be grown on his fields.