Выписать модальные глаголы или их эквиваленты. 1. making friends can be difficult in american schools, as the same group of students does not attend all the classes together. 2. parents have to pay the sum equivalent to the school tax directly to the school the child goes to. 3. soon we shall be able to understand many phenomena which occur on the solar surface. 4. this mixture is to be heated before the experiment.
1. can
2. have to
3. be able
4. is to