Подчеркните сказуемое, укажите видовременную форму и залог 1. numerous actions have been undertaken to encourage the development of small firms. 2. most important works on fields are being done by machines now. 3. tariffs on oil exports will have been raised by the end of the year 4. new methods of management will be studied by economists.

1. Numerous actions have been undertaken (pres perf pass) to encourage the development of small firms.
2. Most important works on fields are being done (pres cont pass) by machines now.
3. Tariffs on oil exports will have been raised (fut perf pass) by the end of the year
4. New methods of management will be studied (fut simp pass) by economists.