1.We do not always call different ports following the instructions.
2. When his ship does not enter some ports, he usually has a lot of work to do.
3.The student on duty does not always report to the teacher at the beginning of the lesson.
4.When he is not around the world, he usually has a good time.
5.It is not very difficult to communicate with a person who speaks a different language than you.
6.In spring, summer and autumn, he does not sail on a passenger liner. In winter, he does not teach navigation at the naval school.
7.This is only possible if the crew does not speak a common language - English.
8.There are no seafarers of different countries and nationalities on board.
9. My friend is often not actively involved in the community life of our college.
10. He doesn't work hard when he is sailing.
Объяснение
толко отрицателние
2,4,5. соотвктвуют остольные нет