Перепишите следующие предложения, заменив модальные глаголы их эквивалентами. 1. the designers can improve the operation of these receivers. 2. the students may use all the laboratory equipment. 3. he must take part in this work.

1. The designers are able to improve the operation of these receivers.
2. The students are allowed to use all the laboratory equipment.
3. He has to (или is to) take part in this work.