Упражнение 6. Образуйте причастие II от следующих глаголов.
a) to hope, to stop, to produce, to listen, to open, to study, to concentrate, to determine, to start, to develop, to play
b) to be, to have, to do, to get, to come, to meet, to know, to make, to cut, to go, to see, to buy, to begin, to choose, to say, to sell