1) Several sailors were on watch, all the rest went ashore.
2) We learn to drive dry cargo ships, liners, motor ships and other vessels.
3) This information is not correct. Do you have any other information?
4) There are two passengers on the deck. One looks through the magazines, the other watches the work of the sailors.
5) Some shipyards build universal ships, others - specialized.
6) When we were in St. Petersburg, we visited the Hermitage, the Peter and Paul Fortress and other sights.