І. Define the functions of infinitives.
1To improve soil fertility farmers must apply fertilizers.
2It is very important to solve this problem.
3This soil is too poor to produce high yields.
4The new method to be used in poultry breeding was discussed at the conference.
5To become a good specialists we have to study well.
6This area is big enough to cultivate different kinds of vegetables.
7 To work on the farm is necessary for every future agrarians.
8The aim of the farmers is to improve soil fertility in this area.
9We are to finish our work in a week.
10Their task is to build a new cattle barn.
11Farmers have to apply more fertilizers.
12To know how a plant grow, you must study botany.
13The builders work hard in order to finish the construction in time.