Найти модальный глагол или его эквивалент. as our meeting was to be held at 5 p.m., we had to finish our work earlier than usual. you should ask your friends to help you with your english. we shall be able to discuss this problem at the next seminar. a candidate cannot practice until he has obtained a certificate from the law society which must be annually renewed.
had to
should
shall be able to (сразу два=)
cannot
must