Помогите, пожалуйста
Подчеркните и выпишите герундий. Укажите его форму, объясните его функцию.
1. Solving such a problem is not an easy task.
2. The task of the factory was producing polymers in large quantities.
3. The idea of utilizing the energy of oceans and seas for man's needs is not new.
4. Without understanding the laws of mechanics it is difficult for the students to take part in research.